Holes and notches in tempered glass, should be located within specified areas per this image.
Glass Edge to Hole Rim: The minimum distance from the rim of a hole to the nearest edge of the glass must be ¼” or 2 x glass thickness, whichever is greater. Tolerance for location of hole from specified edge is ±1/16”.
Minimum Distance Between Holes: The minimum distance between the rims of adjacent holes must be 3/8” or 2 x glass thickness, whichever is greater. Tolerance for dimension between hole centers is ± 1/16”.