Hi,

What I do (assuming there are holes in the corners of the PC boards) is to cut 4 pieces of fuel tubing to an equal length and use them as spacers. I then screw it down using #2 x ? screws into your main floor or mounting board inside the boat. This allows for a simple CHEAP and flexible shock-proof type mount for them....works for me For the ones without holes, you can carefully drill small holes in them somewhere on the board (inspect carefully to figure out where) and drill holes accordingly.

Pete