Studs are a pain since you have to lift the compressor over them

Easier to go to Home Depot and buy lag shields (the lead anchors) and drill for the appropriate size. Get the shields and the appropriate lag bolt. Also, pickup some 1/4" or 3/8" thick rubber pads to put between the compressor leg and the floor....makes it a little quieter. Set the compressor where you want it and mark the floor for the holes; slide the compressor away and drill.

Dont forget to accommodate a drain valve on the bottom of the tank. Screw an ell into the tank and run a line out to a valve so you can drain it without crawling to reach under the tank. We ran our drains thru the wall so we can scare the rabbits outside when we blow off the water.

mike in tucson