If there are a lot of servers, then you may need multiple KVm,s that are stacked so that you can still use just 1 Monitor, as I mentioned.
These are more expensive, but give you more options.
Another option that may work, is to but another small KVM, and hook up the monitor to it, and use the inputs for computers to connect to your existine 3 KVM Monitor inputs.
Depending on the quality of what you have and the one you buy, it may work, but you will need to switch between KVMs first on the new one, and then again on the old ones.
I hope this helps !
