Folks,

Here is what Ifound for my Spektrum AR7000 RX from the manual at link

"Receiver Installation
In gas and glow aircraft install the main receiver using the same method you would use to install a conventional receiver in your aircraft. Typically, wrap the main receiver in protective foam and fasten it in place using rubber bands or hook and loop straps.
Alternately, in electric airplanes or helicopters, it’s acceptable to use thick double-sided foam tape to fasten the main receiver in place.
Mounting the remote receiver in a slightly different location, even just inches away from the primary receiver, gives tremendous improvements in path diversity. Essentially, each receiver sees a different RF environment and this is key to maintaining a solid RF link, even in aircraft that have substantial conductive materials (e.g. larger gas engines, carbon fiber, pipes, etc.), which can weaken the signal."