now for something completely different: something i recommend. 

kvm switches are mostly a lie. sort of like how wifi extenders are mostly a lie. but i have to say that the TESmart HDMI 4k KVM switches i have bought and used at home have been actually rather very good. More often than not they actually work. This is with a crazy range of old and newer hardware, and almost every main OS under the sun (linux, windows, macos, sometimes even *bsd's).