I want to make a setup with 4 computers who connect through the kvm to the same monitor, I want the kvm to be capable of multiple display and mouse/keyboard broadcasting, also I want one with decent latency. I want to see all of the pc on the same monitor without having to switch between them and I want to broadcasting mouse and keyboard buttons to all of the PC at once.

As for the pc I need one with 5 cores cpu, 16 gb ram, a decent gpu, a very cheap ssd/mobo/power supply.

What kvm do you recommend for this job? you can also recommend me a multiview monitor that has a built-in kvm.

What parts do you recommend for the PC in order to be as cheap as possible and also compatible with the kvm?

What should I be careful about? are there going to be compatibility issues with the kvm?

How much will this cost me if I buy the PC in parts and build them myself?