The nipples can't have sharp edges, burrs or spokes protruding beyond the head. A rim tape/strip has limits.
A Dremel or similar & grinding stone can be used to smooth down "sharp" spots.

I presume these are single wall rims since you mention the nipples.
On a double wall rim, I've found rim tapes that are a bit narrow may leave s spoke access hole slightly uncovered.
I like rim tape width that "just barely" starts to run up the wall, but not enough to be involved in any bead seating issues.