Glass table pads

Glass table pads are great for keeping your glass tabletop from getting scratched by the metal base that holds it in place. However, unless the pads allow suction or have an adhesive quality, then your glass top can still get scratched if moved abruptly off the pads. In this case, an adhesive bonding agent along with the pads can help keep everything from slipping and sliding around.
Glass table pads:

Glass table pads pictured: 3M SJ5312 Bumpon Blister Pack, Clear 0.500″ Wide x Long, 0.140″