Ive installed hundreds of imac display, first started with 3M tape, and now testing Tesa. Only 2 of my customers displays have fallen off (?). Which I dont understand, because the bond is pretty solid.
I have started doubling up on the tape to prevent this. two thin strips on the aluminum body and 1 strip on the glass.
Those who say it takes long to remove roll tape, I use a heat gun and very thin spudger/pry tool that slices the tape. Then using your index finger roll the old tape off
I also reheat the edges when the panel is back on and press firmly with a rag around the perimeter to guarantee a good bond.
I did notice some of my customers carry the imac in unatural ways (i.e. upside down, grabbing it by the stand and flailing along) or putting the glass face down in their cars. I always apply some electrical tape outside from glass to body, and ask them to remove it after a couple days