No rubber feet, you want to ground them to the floor with wide heavey bases bolted to the bottom of the speakers with some weight on top of your speaker to push them down to the floor.
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Shame on us all for pushing our individual preferences without seeking complete information.
Nobody asked Mr. Fishcall what kind of floor he has, which makes all the difference. Coupling speakers to a highly resonant suspended wood floor might cause far more problems than it solves, like boomy bass and transmitting tons of vibrational scum into his component rack. OTOH, de-coupling from a solid concrete floor might soften bass response and transients with little benefit.
We need more information before we can offer a properly useful answer.