I used a flat white Dbrand skin and put my stickers on top. My stickers have 100% coverage: https://twitter.com/rxcs/status/888214143097987072. No problems after 2 years aside from some slight fading of the colors on the reflective stickers.

If OP is in this thread, check out 3M 1080 (or newer) series. It is used on cars, designed to not bubble or leave residue, and comes in clear.