Blutak or similar will work fine. I have the same speakers and Blutak forms a very strong bond but does not damage the speakers finish. My own woofer is a mini Dax which is too short to bump into almost anything.
6 responses Add your response
Blutack or another compound may even have a positive effect on sound by damping vibration at the interface with the support.
I don't have a kids/cats problem any more so when a seller included some Herbie's Grungebuster pads with a pair of speakers, I took off the Blutack and tried those. There's no adhesive on them but they really do make a useful sonic difference for not much money.
Maybe this info will be useful to the OP later on.