Beautiful room. Nice pictures.
I have three suggestions for you.
1. (I don't think this is "good", but) how about using a Full-Metal Bracket and mounting the VP150 to the soffit? Wiring would be kind of a pain, though.
2. How about putting the VP150 on a stand up on that shelf in the back, and then putting your Kinect on the VP150? Probably not optimal, because you'd still get some nasty reflections from the TV.
3. Put the TV on an articulating mount (mounted to the wall) and set the VP150 on the TOP/front of the TV stand. I got a mount kind of like this
from Monoprice for a friend's installation, and it is just great. Not sure if you can make the height work out, but might be worth a shot.
I'd do #3. Probably upgrade to a VP180 while you're at it.