I think I was the one that mentioned the rear protector. I had my sister send me one from England. Luckily, she had access to the APO mail system, so it only cost about $7 shipping!
Anyway, it depends on what you're trying to protect. The films will not have the protection of the rigid cover. It might protect a surface scratch, but in my case, the bike in my case folds, and the joint is steel...it gouged the paint on the edge. IMHO, a film would have ripped. Also, while some films stretch, it would be tough to get it nice and smooth over the curved edge and down the vertical far enough to protect the edge while staying in place. Also, installing the thing was a piece of cake. Starting with a clean surface, you use the special wipe the provide, tear off the protection on the double-sided tape, and set it in place...done. Mine's been down for nearly 4-years, looks as good as the day it was installed.
2014 i3 BEV, 2021 X5 45e
(The i3 will be sold soon, <17K-miles, interested?)