chefwong- Just dealt with this on the Denali XL, which has quite a bit of PPF all over it (the Porsches/Audis/BMW just had little areas of factor PPF that were easy to work around).
That overlapped-edge taping is what I did when working on the surrounding paint and I don't expect to polish the PPF all that often.
When I polished the PPF itself, I didn't bother taping the edge, I just "worked off the edge" as best I could. Seemed to work OK, no polish buildup along the edge; whatever was there wiped right off with the other polish residue.