What I do is use some heavy-duty velcro on the bottom. In my little pea-brain, I think of it as isolation from the airframe. I also wrap a length of velcro tape (availabe at your favorite Lowes).

I usually make a mount of 1/8 ply that is "shock mounted" to the fuselage then put the receiver on that with the velcro mount. Works pretty good and, to my pea brain, isolates it (as I said.. jeech. I must be tired). The AR7000 receiver (DX7) is light enough that it does not require a lot of foam padding, and I feel that the method I use seems to work well. I've never had a problem.

CGr.