I assume you mean Keyboard Video Mouse (KVM) Switch and not Kernel-based Virtual Machine (KVM)?
I just use SSH...
Our sysadmin swears by Dell's iDRAC, which I don't think is technically a KVM and may only work for Dell PowerEdge Servers. I think I used it once to get into the BIOS remotely.
Most data centers I've been in have a floating monitor and peripherals.
I've used Tripp-Lite terminal servers, who sells KVMs, but I cannot comment if they are any good.
https://x.com/realDonaldTrump/status/1142157838153895941?mx=2
They were setting the stage for this in his first term.