I hate those Yakima towers and clips. It's not a question of if they will scratch and dent your roof and door sills, but when. I've had roof damage (dimples) and scratches underneath the door frame where the clips grab in two different cars I've owned in the past. I won't be installing racks unless the car comes with roof rails. The Bolt Premium roof rails are a huge selling point for me, I'm glad GM offered them.