Multi-screen 4 laptop multi-monitor KVM

I'm looking for a 4 laptop multi-monitor KVM. The laptops and available ports are:

HP Elitebook 850 G6
* 2x USB 3.1 Gen 1 (one of which is a charging port)
* 1x Thunderbolt (USB Type-C connector)
* 1x RJ-45 (Ethernet)
* 1x Headphone/microphone combo jack
* 1x HDMI 1.4b
* 1x Docking connector
* 1x AC power port

Dell Latitude 5421
* 2x Thunderbolt 4 with Power Delivery and DisplayPort (USB Type-C)
* 2x USB 3.2 Gen 1 (one with PowerShare)
* 1x HDMI 2.0
* 1x RJ-45 (Ethernet)
* 1x Universal audio jack
* 1x microSD-card slot
* 1x Smart card reader slot
* 1x Wedge-shaped lock slot

Dell Latitude 5440
* 2x Thunderbolt 4 with Power Delivery and DisplayPort (USB Type-C)
* 2x USB 3.2 Gen 1 (one with PowerShare)
* 1x HDMI 2.0
* 1x RJ-45 (Ethernet)
* 1x Universal audio port
* 1x microSD-card slot
* 1x Wedge-shaped lock slot

MacBook Pro (M4 Max, 16-inch)
* 3x Thunderbolt 4 (USB-C) ports with support for:
* Charging
* DisplayPort
* Thunderbolt 4 (up to 40Gb/s)
* USB 4 (up to 40Gb/s)
* 1x HDMI port
* 1x SDXC card slot
* 1x MagSafe 3 port (for charging)
* 1x 3.5 mm headphone jack

The monitor that I’d like to use is:
Dell UltraSharp 43 4K USB-C Hub Monitor (U4323QE)
* 1x DisplayPort 1.4 (with DSC)
* 2x HDMI 2.1
* 1x USB-C 3.2 Gen 2 upstream (with DisplayPort 1.4 Alt Mode and 90W Power Delivery)
* 3x USB-C 3.2 Gen 2 downstream (15W)
* 4x USB-A 3.2 Gen 2 downstream (one with BC 1.2 charging)
* 1x RJ45 (Ethernet)
* 1x Audio line-out

My questions are:
• KVM solutions
o Quad monitor KVM – The Dell U4323QE monitor is a single screen but allows quad view (four monitor equivalent) via picture-by-picture (PBP) technology and dedicated individual ports. Would a four laptop and four monitor KVM solution be compatible with the laptops’ and monitor’s ports? Also, a broader question that I have is: can all laptops be used in a quad monitor solution with creative adapters/cabling, or are there limitations with the laptops themselves that prevent quad view?
o Dual monitor KVM – The other alternative that I’m considering is connecting two of the four quadrants of the Dell U4323QE to a dual monitor KVM (with four laptops) and connecting the other two quadrants directly to the MacBook Pro that’s listed above. Are there enough of the right ports (or adapter compatible ports) that would allow connecting both the KVM and MacBook? In this solution, I’m assuming that I would need to use two keyboards, mice, webcams, etc.

• Monitors
o I’m completely open to your monitor recommendations. Are there any monitors that you recommend that are most compatible with KVM solutions?

• Peripherals
o Can one webcam be shared by the four laptops on the KVM?
o Can they share the same keyboard, mouse, and possibly speakers?

• General
o At times, I may only have three laptops connected to the four laptop KVM. Is that OK? Will it just render a black screen on the channel for the missing laptop?

Thanks in advance for your time and recommendations. Please let me know if it would be easier to discuss possible solutions over the phone. Thanks.

Dan

 

Here you go:

Laptops:

HP Elitebook 850 G6
2x USB Type-A (USB 3.1 Gen 1, one of which is a charging port)
1x USB Type-C (Thunderbolt)
1x RJ-45 (Ethernet)
1x 3.5 mm Headphone/microphone combo jack
1x HDMI (version 1.4b)
1x Proprietary Docking connector
1x Barrel AC power port

Dell Latitude 5421
2x USB Type-C (Thunderbolt 4 with Power Delivery and DisplayPort)
2x USB Type-A (USB 3.2 Gen 1, one with PowerShare)
1x HDMI (version 2.0)
1x RJ-45 (Ethernet)
1x 3.5 mm Universal audio jack
1x microSD-card slot
1x Smart card reader slot
1x Kensington Wedge-shaped lock slot

Dell Latitude 5440
2x USB Type-C (Thunderbolt 4 with Power Delivery and DisplayPort)
2x USB Type-A (USB 3.2 Gen 1, one with PowerShare)
1x HDMI (version 2.0)
1x RJ-45 (Ethernet)
1x 3.5 mm Universal audio port
1x microSD-card slot
1x Kensington Wedge-shaped lock slot

MacBook Pro (M4 Max, 16-inch)
3x USB-C (ports support Charging, DisplayPort, Thunderbolt 4, and USB 4)
1x HDMI port
1x SDXC card slot
1x MagSafe 3 port (for charging)
1x 3.5 mm headphone jack

Monitor

Dell UltraSharp 43 4K USB-C Hub Monitor (U4323QE)
1x DisplayPort connector (version 1.4 with DSC)
2x HDMI connectors (version 2.1)
1x USB-C upstream connector (USB 3.2 Gen 2 with DisplayPort 1.4 Alt Mode and 90W Power Delivery)
3x USB-C downstream connectors (USB 3.2 Gen 2 with 15W power)
4x USB-A downstream connectors (USB 3.2 Gen 2, one with BC 1.2 charging)
1x RJ-45 port (Ethernet)
1x 3.5 mm Audio line-out port

 

The fourth video input is the USB-C upstream connector. This port supports DisplayPort 1.4 Alt Mode, which allows it to receive a video signal from a compatible device using a USB-C cable.

The four available video inputs are:
1x DisplayPort
2x HDMI
1x USB-C (upstream)

 

The Dell U4323QE monitor quad view can also be split using its PBP mode into two separate dual-monitor systems (i.e. two vertically stacked dual monitor layouts; two monitors on the left, and two monitors on the right). My goal is to run my MacBook Pro directly on the two left quadrants while simultaneously running my four other laptops through a dual-monitor KVM on the two right quadrants.

Left Side: Have my MacBook Pro connected directly to two of the monitor's inputs (e.g., USB-C and HDMI-1) to create a single, vertically stacked dual-monitor workspace on the two left quadrants.

Right Side: Simultaneously, have a 4-port, dual-monitor KVM connected to the two remaining monitor inputs (e.g., DisplayPort and HDMI-2) to provide a shared, vertically stacked view for my other laptops on the two right quadrants.

From the KVM and connection-type perspective, would this solution work? Would you recommend any changes to the connector usage choices for the available connections on the monitor?

 

I have identified the LG 43UN700-B as a more KVM-friendly monitor, instead of the originally mentioned Dell U4323QE that had connector limitations. With the ports listed below, would the LG 43UN700-B be capable of working with a 4-laptop and 4-monitor KVM?

Here is a complete list of the LG 43UN700-B monitor's I/O ports for your reference:

Video Inputs:
HDMI 2.0: 4 ports
DisplayPort 1.4: 1 port
USB-C: 1 port (supports DisplayPort Alternate Mode video input)

Other Connectivity:
USB 3.0 Downstream: 2 ports (Type-A, for peripherals)
USB-C Upstream: The same USB-C video input port also serves as the upstream connection for the USB hub and provides 60W of Power Delivery.
Headphone Out: 1 port

Given this port layout, which 4-laptop and 4-monitor KVM switch would you recommend as the best match to drive all four quadrants of this monitor simultaneously?