The 90degree model is intended for situations where you are unable to screw into the intended mounting surface, but able to screw in the adjacent surface. Such as mounting under a wooden table, with a steel frame or just a very thin ledge.

Flat model pretty much speaks for itself.

Both the flat and angled model leave 0.5mm for squeezing the strip in place in the top, as well as a combined 1mm squish in the sides. Not ideal for placing ontop of the cob-LED in the middle of a segment. Although i do print mine in transparent PETG in case this just happens to line up with the CW or WW LEDs.

Included some mounts i made for a Samsung 55'' TV, to mount a strip to the back for lighting up the wall with automations linked to the function of the connected Apple TV.

The models intended for the recessed screws have notches intended for zip-tieing if needed. -Beware that you will have to squeeze the strip quite a bit if you intend to use the original screws. And that bridging will need to be on point so the screw has a chance to reach. I did manage to use the originals though.