Quoted from markmon:Fyi carpet sliders are fine on carpet, tile, and hardwood.
Another option is levelers with a nylon base or those rubber "shoes" for your existing levelers. It's tougher to get close to the wall using carpet sliders.
Another consideration: how's the ventilation in that room? With the heat from 11 machines (even with LEDs) plus a few people in there playing, it might get stuffy quick.