Im not worried about the latency. It can control more than two or greater numbers of computers over 500.
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Do kvm switches add latency. That being said ive been reading that kvmusb switches can cause issues where you may experience latency difficulty detecting devices etc. Most kvm switches that support usb have such a general purpose port which is sometimes marked as the mouse port. Which is obviously not cool for gaming. Id say read the reviews. Yes latency time within 1 second while switching between channelsports. Then connect the keyboard display and mouse console to the kvm switch.
However you could do this through software. The only possible latency can come from the specialized keyboard port on the kvm because that scans keystrokes for certain magic key combinations that prompt the switch to switch over to the other pc generally default keys for that are pressing scroll lock twice followed by a command for the kvm. In a cut through design you may get 90ns latency but you will not be able to apply many acl rules in processing. Manufacturers base price more on the quality of the switch than on the number of ports provided though it seems in some. Some kvms have noticeable input lag and are unacceptable for gaming. Users can use cat5 cables or the specific kvm cable kits to connect the computers to the kvm switch.
Razers support for their peripherals specifically says that it does not recommend using kvm switches for example. Answered march 19 2018. 94675 views published on jan 29 2013 new class of ddm kvm switches are the worlds fastest kvm switches with no latency in video usb hid devices keyboard mouse drawing tablets and touch. It depends on the silicon and methodology used in the switch design and also what processing you are doing to the packet as it traverses the switch. Im not sure about the ones you linked to though. Kvm switches range in price from as little as 10 to nearly 200 or more.
Synergy and multiplicity both allow you to use a single mouse and keyboard on one machine to control the second machine. Im not under any illusions that im a competitive enough gamer for that to matter.