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I have a 2019 model S and I mounted it to the passenger side of the rear view mirror and the one time I went through a toll it didn't seem to work. I'm going to do some more testing.
I just got a 2019 model S 75D and mounted mine on the passenger side of the rear view mirror and it doesn't seem to work. I'm going to test it some more but the one time I went through it didn't register.