ADS-B aft of baggage bay bulkhead
I have the same setup and installed mine just aft of the baggage bay bulkhead on the left side when viewing rearward. I fabricated an aluminum tray, secured it to the stringers, and mounted the GDL 82 on it. I also piggy-backed my GDL 50R on top of the GDL 82. Routed wires/cables through the bulkhead former, then sub-floor forward. Everything is accessible come inspection time when I open up the tailcone.
Bob Gordon
N681GP
Concord, NC