Hmm.. Not so easy to predict the outcome. In any case, you don't want the speakers to float on the carpet even if they sit on marble slabs. You probably don't want to do it because it's not cheap, but I would get big threaded Audiopoints brass spikes to try first. Some might also recommend Mapleshade or Vermont Audio big fat brass footers. I never tried them, only Audiopoints, but suspect that they may be slow which would be unacceptable to me.
I myself have a hardwood floor but no carpet so my arrangement would not be of much use to you.
I myself have a hardwood floor but no carpet so my arrangement would not be of much use to you.