I have a 60 gal one from Northern Tool. I nailed a 6" square of big truck tire re-tread to a 6" square of 2X4, screwed the compressor feet to the wood side so the rubber side sits on the concrete floor. The compressor floats on these feet. I then loosely chained the compressor to the wall. It has never moved & I can't feel any vibrations in the floor. I used a 2 ft section of hydraulic hose to connect the compressor to the piping system. You'll probably get a lot of different opinions on rigid vs non-rigid mounting. Another source of a lot of opinions is garagejournal.com.
