If this happen, so be it, i'd be only be worried about burning down the block or such serious fire. Hardware is replaceable and i dont think it would happen in the first place if things are properly wired with twist lock plugs.
I'd be using a pro to install the wiring so even tho the wiring would be exposed, as it would be ran on the ceiling corners toward the server room, i dont see why it would be any more risk than if it was
in the ceiling.
Law wise, what are the penalty for running such an exposed-ish cable from the breaker to the ceiling, to a room?
Tearing down the bathroom to run an 50A cable under the bath doesnt sound safer to me.