As far as your analysis on mounting position, that's exactly where I have mine. It's almost impossible to see outside the car and it's even survived the car being inadvertantly left unlocked several times overnight.
My power wire runs right down the A pillar (by the windshield) and the power supply thing-a-ma-jig plugs right into the fuse box with no fancy wiring needed.
I used to swap the V1 between the car and my old truck and never noticed any difference between it being behind the tint on the GTO and on the dash of the truck.
As far as your last question, I really can't answer it...
04 QuickSilver - !CAGS, Lingenfelter CAI, 05 Bumper with Stainless Works 04->05 cat back, Power Slot Rotors & Hawk pads.