You can keep it here. I usually use contact cement instead of glue no need to clamp and easy to use. Cut the veneer about 1/8" oversize you can sand down later to meet the edge when the cement cures. If you don not have a perfectly flat surface with weight you will get ripples in the veneer because of the uneven pressure when you use wood glue. If you use glue make sure the granite covers the entire area to be glued and the still place heavy objects evenly over the granite (hope the granite is very flat) such as bricks or a five gallon bucket full of water for the extra weight. Lay wax paper between the granite and the veneer so if glue seeps up it will not stick to the granite.