Usually you can call Libre and get them to replace them. At least for a few of them. At the beginning I knocked off a few by hitting them just right, car seat, door frame etc. Placing them more directly in back of the arm helps stop some of it. I never ended up using anything else, I just became more aware of being careful about it. My hubby helped with that. When I would get in the car he would remind me watch your sensor!!!
There are patches you can buy to help as an extra layer that makes it harder to come off, that might be the extra protection you are wanting.