That looks good. I put my mtb in the back all the time and its a pain in the ass. My road bike wouldnt fit with your set up. Its 58 cm. I lay them down with both seats down. Would love to even have the hitch but have been hesitant to cut the bumper. And like you said having thief bait external of the car is nerve racking enough. at least with this you can run in a store or something and feel relatively safe.

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2008 E70 4.8i sport
space gray 20" staggered 214 wheels
Tech package
Cold Weather
Comfort Access
HUD