I mounted my Dynon ADHRS on the inboard inspection panel of my LH wing. I used aluminum shims and brass screws to level it to be fuselage. After 640 hrs of operation, it has worked perfectly. I did discuss the installation with Dynon back in 2014 and we could not find any technical or safety issues with putting it there. AOA and pitot lines are a short run, the network cable is a short run through the LH side of the spar up to the panel area. Also have a the same installation in a 9A and it has also worked fine for 350 hrs. For water proofing the inspection panel, I put a thin layer of RTV on inspection panel mating surface and let it dry before installation.