Those locations should be fine. On my Laser 200 with Brison 3.2 I have my ignition box mounted to the fuselage floor directly behind the firewall. I have my ignition and receiver batteries velcroed to the side of the fuse, one on each side, directly above the ignition box. The switches are mounted to the side of the fuselage 2 inches or so aft of the batteries, again one on each side. My radio never glitches and I have terrific range checks with the engine running. I do use a Bosch shielded cap on my ignition, but don't know how much of a difference this makes, if any at all. So, on the Edge I wouldn't hesitate to mount the switches where Wild Hare suggests. Good luck!