KVMs usually jump from 2 inputs to 4. Ones that do 4 inputs and 4 monitors exist but you're entering "enquire for price" territory.
Why do you need so many laptops/screens?
Share mouse and keyboard. All software, cross OS compatible. It's not KVM, because no video. Instead, you slide your mouse off of one screen and then start controlling the next laptop.
IMHO It just feels right to me, especially when you have multiple laptops/workstations around the same desk.
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