I didnt say it was totally inaccessible, but no one wants to through the back, and wade through the cable mess, move cable management arms and get your fingers cut just to turn a machine on or off, or reset it.
What datacenter reboots servers manually?
I would recommend using a y-cable to connect one switched PDU power drop to both power supplies.
Login to web interface, click power off, power on. Tada no need to leave your office chair. If someone was super crazy they would integrate cgminer with the API in popular switched PDUs to auto power cycle when miner appears to be down.
Note: photos are for NEMA 5-15 outlets (120V, 15A). Most likely datacenter is going to run on 208V in the US. If someone was going to install a dedicated branch circuit at home for miners no reason to not go 240V. Double the power for the same current, higher efficiency, and lots of used PDU on ebay for cheap. Still the same concept applies at 120V, 208V, or 240V.