I bought the magnetic when I bought my 3 - while installing I emailed Ottosteer because it seemed it might rub on the car when you hit bumps or high wind/speed. They never replied. I was busy and just said F it and installed it.
6 months later you can see it's GRINDING AWAY MY PAINT
SO I SPENT $80 TO AVOID FACTORY MOUNT ADHESIVE ON PAINT AND INSTEAD JUST STRAIGHT UP RUB MY PAINT OFF
emailed Ottosteer again with this picture and video and they again havent replied (been over a week). They DID reply about their toll tag mount that doesnt even stay put in the car, so specifically choose to ignore this fatal flaw of their mount.
This photo is a bit tough to see but that's after a car-wash perfectly clean, and it's more noticeable in person. Site won't let me upload the video of how easy it is to push on the plate and make it hit the bumper in the exact spot of this damage.