No. To take the photos I just "snapped" them in. The lips hold on to the bumper by themselves. No screws, no tape, and no adhesive of any kind were used. I took the photos, and them I snapped them off.
I think they fit very well. In my first post here, I asked about the quality because I wanted something that would fit without having "to pull or push or use a heat gun to make it fit". I think I got exactly what I was looking for.
I will fit them again with more time and patience (this weekend). Maybe in 2 weeks they will be painted and installed. I will paint them at home at guess.
