I have been fretting about the installation of the ADAHRS module for a few months. I actually started a mounting bracket that would fit behind the luggage compartment. Yesterday, when I was looking at other RV Dynon installations, I came across a simple, elegant way of installing the unit. I used two aluminum angle iron pieces and just installed them between the two fuselage lonerons. It is extremely stable and lined up as close as possible.
I took plenty of time to make sure everything was perfect before attaching everything.