Good idea, poor implementation so here's a better solution:
Z3 Bras, StoneGuards, DoorGuards, more
The Doordefender looks really obvious and would be subject to vandalism and theft. The ones from Z3solutions looks more intuitive and natural and don't arouse any suspicions at all.
If the length is wrong, cut them to fit. They come in pairs. Leave them black or have them painted to match. I had mine painted Imola red. They are kept in a cardboard tube in the trunk and used in emergencies.
Placement is determined by a marking line on the same cardboard storage tube. Easy to place/position.
Marring on the paint by use? Nope, I've had them 3 years now and use common sense.
Gentle on, gentle off, clean the contact side before application, no driving with them on.
Would I buy mine again? Yup.
Would I buy those? Nope.
-John C.