TLF give great advice! Since he deals in the product you can't go wrong with his advice.

For my two cents I have gast compressors (three of them) and I find if I don't screw them down they tend to vibrate and make noise. I also use a foam underlayment. On my compressors there are attachments with holes to run a drywall screw through into the plywood base.

I built boxes of plywood that are simply square with two by four legs. On top is a hinged lid with a latch for closure. I got vents from a local building supply and put one on each side. Make sure if you build one to allow plenty of space for cooling (mine don't have fans).

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.