I have used my TAG in both my +8 and Merc. On the 1980 +8 which is just clear glass it's positioned alongside the rear view mirror. On the 2016 4x4 Merc GLE43 its positioned adjacent to the central mirror console below the shaded area. On circa 10 cross European journeys in both cars I have only had a problem once (Merc) and I did as suggested wave it out the window. Do approach the barrier as requested at slow speed. Enjoy the drive.
