My GRT magnetometer is on the rear deck. Works fine.
One consideration though: The D-Sub mounting screws are a pain because they are up against the HS spar. You have to use a small stubby screwdriver (like a power screwdriver bit) which gets dropped into the fuselage....
If the HS spar would go ahead and crack and fall off, the D-Sub would be easier to install.
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.