Afaik there is nothing ACC related mounted on the windshield. It is just the lane change/high beam/roadsign camera etc and since that has a fixed mount it doesn't require a recalibration....AFAIK.
Just make sure you get an OEM windshield (or your lane change might not work as good anymore, think the previous owner replaced it with cheap alternative here) and they don't screw the heat element on the camera. Again, as far as i remember you don't need ACC recalibration (what's up with dealers...).