Has anyone found the solution to properly mounting an EZ Pass (or other) transponder on a 2015 Model S? At first I used my old square unit (about 4" x 4"), but it was larger than the rectangle to the right of the mirror intended for transponders. Then I used a license plate mounted unit, but the Tesla bumper is too low for our local (Richmond VA) scanners to pick it up. Then I tried the smaller profile window unit (about 2" x 4"), which would seem to fit perfectly in the black space adjacent to the mirror. Unfortunately I continue to violate the toll booths on a daily basis. I've even tried holding the darn thing out the window, but that doesn't seem to work either. Tesla service says the smaller transponders work perfectly in the blacked out windshield space, but not for me. Any advice?