Remove the glass table top from the base. Clean the top of the base where it will touch the glass and allow to dry. Plan where you will place the bumpers. If the table top sits on three or four legs, place a bumper on top of each one. In more ambiguous situations, you will need to evenly place bumpers on the base. The bumpers will show through the glass, so it is best to measure carefully and use the minimum that will stabilize and secure the table top.
Peel a bumper from the protective backing and press it in place. Repeat until you have installed the number of bumpers that you need.
Replace the glass table top on the base and ensure that it is properly aligned.