Turbosport

Hey gang....I'm trying to help my dad by installing the A8 XM Module on his 07 Q7 3.6 Premium. Accessing the cables and connecting the tuner went without a hitch (using the Terk splitter), and the tuner works fine when testing prior to mounting. The hang up i'm currently on is how to mount the damned thing. Based on the pictures I've seen from other folks who've installed it, it appears to mount above the fusebox in the right rear luggage area. No matter how I try to orient the tuner, it simply does not want to slide in either above the fusebox or below it next to what appears to be the AM/FM tuner. My question is, does the entire right interior panel have to be removed just to mount the tuner? It seems excessive and I've seen no references to it, but at this point I have no idea how else to mount it. Any ideas?