Spikes on tower speakers

This is my first post here, just getting involved in the earlier stages of serious stuff. I recently bought a pair of Piega p4L MKll speakers. They sound great, at least according to my perhaps unsophisticated ears.

My question/problem: The speakers have spikes on them that cannot be removed because the previous owner glued them to the base. Becaue of the spikes, the speakers are very unstable on the carpet in my listening room. I need something that the spikes will go into so that the speaker towers will be more stable. So far, neither plywood nor small metal speaker spike pads have worked. Am now considering carbon speaker spike pads and hockey pucks to get the spikes into and then a bigger base, such as wood or even granite/marble.

I would greatly appreciate any suggestions that would solve this problem.