I was unable to but a windshield pike pass in my 2015 model S and had to put one on the front of the car.
Now I have a Model X. Can I mount on the windshield and where?
They have one with suction cups. It mounts at the very top of the glass where the glass meets the roof to one side of the raceway that goes to the mirror. They will give you a diagram showing where you to mount it.