If you can pop it off .....do.... and clean all the existing glue off. Put a bead of silicone on it and put it back on . Tape it up tight and allow the silicone to dry and it' ll be fine. Or I have also used 2 sided carpet tape before and it worked really well.

If you have trouble getting the grip off ....a hair dryer or heat gun will help loosen the factory glue !! Good Luck !!