Need suggestions for speaker platforms - Klipsch Forte IIs on marble floor

I'm going to be moving to a new place in a few months, and I need advice on proper isolation for my speakers. The floors in the new place are all marble, and the walls are predominantly stone/brick. I can get audio treatment for the walls, and carpets to help deaden the floor to an extent, but the design of the Forte II is (apparently) intended to directly couple with the floor. That might be okay for a wood or carpeted floor, but hard marble is going to send a million out-of-phase vibrations all over the place. What can I put under the speakers so they behave, and prevent the room from turning into an uncontrolled sounding board?