1. Once completely satisfied with location and amount, have new bumper/grommet installed and move the tape under the bumper at noon. 1/4 tape should fit nicely and be invisible and protected from damage by stringing. You cannot "reuse" grommets, so you will need a new grommet.
2. Or, use the gap method, where you leave a gap for the mounts of your stringing maching.
You cannot reuse lead tape either as it usually gets pretty mangled in the removal process.