Glue is under the black part of the glass, not under the clear part of the glass.
The Glue is mostly around the top and bottom about 1/2 inch in or so, around both left and right edges the strip of glue is very thin about 1/8 inch or so.
I had success with heat and sliding the tool or pick up and down the side where there is less glue until it started separating being careful that I was between front glass panel and the black plastic bezel.
Use extreme caution when lifting the board. There are 2 ribbon cables that are extremely fragile, 1 connecting the rear facing camera and another connects the volume controller flex on the logic board.