Transponder windshield Telepeage

Hello, maybe someone has experiences here. Since I am always on the road in France, I plan to get myself a telepeage transponder. Maybe someone already has such a one in use and can tell me his experiences for mounting the transponder. I have a V70 OceanRace model year 13. In the manual page 108 … field in which no IR film is applied A 47mm B 87mm. Both in the picture with dimension arrows from above. Probably there is a complete strip of 47mm to 87mm from the upper edge of the disc without coating? Would not like to destroy the merits of the German/French reconciliation in the last decades by blocking the passage track as a foreigner because the thing does not work cleverly ;-). Unfortunately, my French is too bad to ask this question in a French forum. Many greetings, Karsten