Multiple WR1/WT1?

So Monitor Audio has these pucks that beams sound through the air, and I would like to use those for three sets of speakers (so 6 channels total). Clearly, this would require three each of the WR1 and WT1 pucks, but would this also cause significant issues with interference - that's three devices transmitting on the same frequency, after all? Are there any other issues I should be aware of with this?