If multiple protectors have failed in the same area, that suggests that the phone's screen isn't perfectly flat, and may be distorted in that corner. Think back to the days of the 6-series and the "halos" around the perimeter of the screens due to the disparity between the curvature of the screen's edges, and the flat protector glass resulting in separation.
Otherwise, it might be something in the way the phone is held, or carried that is causing lifting?
They're not cheap, and it may be kind of silly to spend that much money on a protector, but a last resort would be to try one that uses a UV-cured liquid adhesive, like the
Whitestone Dome.
Its liquid adhesive will do a better job of conforming to and filling uneven gaps than a static adhesive layer of a normal protector, and for something with extreme screen curvatures, like Samsung's phones, they were the better option.
I've installed a few, and the process isn't for the faint of heart, or ham-fisted, but really kind of neat.