Your power supplies should be all the protection you ever need. I would hope with that many rigs you are running quality PSUs and not some ATX garbage to power them. I have managed multi-megawatt facilities and surge protection was never even brought up as an issue even on unregulated power.
Hereeeeeeeeeeeee comes OVERKILL. Lol ... Are you insane dude? You may be a genius level electrical engineer, but you know absolutely nothing about risk vs. cost effectiveness analysis for small scale operations. Surge protection is a huge concern for electronics in the typical home environment.