Emails from Johnny@CKL after setup and after troubleshooting. It works like a charm. Beware of DP-HDMI cables. I had one that worked on an HP workstation and another of exactly the same type that didn't work on a Dell Latitude. Johnny recommended a short unidirectional DP male to HDMI adapter and it worked flawlessly. Remember that all USB to HDMI adapters are mainly for USB3. CPU ports and only shows 800x600 on a USB2 CPU port. Once completed it works like a charm and my client is delighted.
TESmart 1080P 60Hz USB VGA KVM Extender Over Cat5e Cat6 Ethernet Cable - Long Range 984ft/300m (Sender+Receiver)
10 Review
4 Port USB 3.0 Switch Selector - Pubioh KVM Switch for Mouse, Keyboard, Printer, Scanner - 2 in 4 Out Sharing Box with Switch Button and 2 USB 3.0 A to A Cables
11 Review
CKL Quad Monitor HDMI KVM Switch 4 Port 4K@30Hz with Cables - Extended and Mirrored Display Support for Windows, Linux, and Mac
11 Review
Enhance Productivity with CKL HDMI KVM 2 Port 4K 30Hz Dual Monitor Extended Display (CKL-922HUA)
10 Review