Works on walls also!
Your review: I needed to reduce vibrations from an Arzel HeatPumPro HVAC zone control box mounted on a non-load-bearing wall in my basement. Vibrations from the two vacuum pumps produced an unacceptable amount of noise throughout the house. I purchased 4 of these floor mount vibration isolators and mounted them to the 3/4" plywood panel attached to the wall. I then bolted a 3/8" plywood panel to the isolators and hung the HeatPumpPro on it. The noise is gone!