e-zpass

Has anyone successfully enrolled in the NJ EZ Pass Green Discount Plan? Sounds like they want you to write them a physical letter requesting to be added to this program (What year is this again?) :: Plan Descriptions and Discounts :: Do you get a new, special tag of some sort? How do they know...

Does anyone have any experience with this? On my previous car, I had it mounted behind the mirror, but that's not going to work for the Model Y because the cameras are there. Also, the instructions say it doesn't work with a non-metallic roof.