I followed the install with the 3M tape. I did not want to drill my trunk. It is pretty much on for good with the tape. I guess the real test would be to run it through an auto car wash but I have not done that yet. Probably never will. I open the trunk with it now, handy handhold and you do not see the fingerprints on the paint, cbp.
I would just recommend that you have a person to help get it lined up. I set mine down first where I wanted it and marked the upper outside corners with the blue paint tape. Then I pulled off all the 3M tape cover, set the corners first and then just pressed it in place firmly and held it for about 5 minutes. Worked perfect.
Worst case is if you mess up you can cut it off with fishing line, use the 3M adhesive cleaner and start over.