2018GLC300

Ive received the new IPass stickers ( about 3/4"x2") from Illinois state ( these superseded the transponder box that used to be the option ) and these stickers apparently don't have any battery etc embedded, but once you stick it on your windshield..it stays there...cant be re-positioned, it can be removed ,but then it gets destroyed.The instructions are pretty basic and says stick it behind the wind shield mirror, the picture shown looks like its some 1980s car with just a mirror support stuck on the windshield..lots of empty space around the mirror support....unlike the newer cars - GLC300 to be specific , there is basically a 18"x12" of blacked area on the windshield , behind the rear view mirror, which automatically excludes placing a sticker there.
So...my question is ..has anyone installed this new IPass sticker on a GLC300 and verified the toll gizmos read this correctly with no issues.?
Also my understanding is some newer cars have special windshield features that may not exactly compatible with these stickers ...I hope GLC300 is not one of those..

Jetfuture

Have the new sticker to the right of the rearview mirror unit, and slammed up high - no problems as of yet. 2016 GLC300