Let me dispel a misconception for you; a breaker is not placed in the panel to protect equipment that is plugged into an outlet; it is there to protect the wiring running between the panel and the series of outlets powered by that circuit. If a branch circuit is overloaded due to too much being plugged in, or because one item plugged in develops an internal fault, it is the job of breaker to prevent your house from burning down. The last thing you want to have happen in the event of excessive current draw, is for the wire to heat up, melt off the insulation, and start a fire somewhere in the wall, attic, crawl space, etc where the wire is routed on its way to the outlet.
Breakers are sized to match the wire. 20A breakers usually feed 12AWG wire; 15A breakers feed 14AWG.
If you want "protection", make sure the power supplies in the computers have the correct sized power supply. Plug each computer, its monitors, printers, into its own multiport outlet-strip which has a built-in thermal breaker, and transient protection.