Polished is pretty and easier on your Axiom's bottoms.

I think mine sound better sitting on granite slabs (I prefer Brazilian uba tuba for its green and black intrusions) than on the carpet, spikes would probably be fine. Of course combine uba tuba slabs with superior speaker cabling and you'll really be cooking.

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.