Anyone try Cerapucs under full range speakers?

I didn't mean to cause a ruckus here! :-) My thinking was along the lines of the fact that my speakers are over the basement on a suspended floor. I figured spiking them to the floor (which may be optimal for a solid floor) may "enhance" the coupling to the resonating cavity below. I wondered if dissipation in this case might be a better option. I'll admit I don't know much about this! 

So in this case, is spiking or decoupling the theoretically better option? (All determined ultimately by listening, of course.)