[RSH]

You can, but imagine the whole floor shaking passing all the vibrations to the walls and ceiling? May not be the best approach. Now if you build a platform and install it on the kinetic isolators, it would be much better option- this way you would decouple the whole thing from the floor.

Also remember - to shake the floor or the platform you need much more power than just to shake the sofa (if the BK is attached to the frame of it). This may introduce a slight delay, which is undesirable. Attaching the buttkickers to the frame of the sofa will give you more localized and precise effect and will work better with your sub(s).