They're mono units, so you'd need two on different freqs - plus you'd need another stereo amp in the back of the room and a means of controlling the volume. Very clunky.
I'd suggest you pull up the edges of the carpet and run the wires from your home theater receiver between the wall and the carpet tacking strip, then carefully put the carpet edges back down. I've done that in lots of houses.
Home theater demands a good receiver - and not TWO receivers. A different amp for the rears may introduce phasing problemos as well. Not a real "swuft" ideer.
Michael