People aren't mentioning width enough. The FWDs need space to open out too. Unless you have a good amount of space on both sides of the car in the garage, you'll be unloading before you get in garage and letting car park itself.
My garage height is fine, but my driver side FWD is about 16" from wall and can't open enough for anyone other than a smurf to get out. So, when I have all my kids in the car (with car seats), I have to unload outside garage.
Just put insulation/foam on your rails with tape and don't worry about it. The doors move so darn slow, they won't get hurt at all by touching the foam.
I am lucky, and my FWDs sense the rails. BUT, in a parking garage today, one of them would have hit concrete beam that was lower than the ceiling had I not been there to stop it.
I love the convenience/access of the FWDs, but do think the sensors were poorly placed and, largely, not capable of working well in situations where they're most needed. Likely not a retrofit, but a v2 change.