There's no way the rear mud flaps are supposed to be installed in front of the rear wheel. That would make no sense as gravel kicks to the rear, not the front of the tire. Any Model Y mud flap product you find on Amazon clearly shows pictures of the rear mud flaps installed behind the rear tires, not in front of them. Point of the rear mud flaps is to prevent gravel from kicking up and damaging the paint directly behind the rear tires and vehicles traveling behind.