Hello! Not sure if this is the right sub- I'm doing a bit of a "landlord special" in a rarely used 3rd floor bathroom in my house. I bought this peel and stick wallpaper that is like the cheap vinyl feeling kind. I'm worried it's going to peel off if the shower gets used/ if there's a dramatic temperature change. I plan on totally redoing this bathroom in 5 years or so, but want to spruce it up for guests in the meantime. Should I staple the top of the wallpaper? Add flexible trim and secure that over the wallpaper? Any other ideas?

The ceiling is kind of sloped but also not totally even because it accommodates the shape of our roof.