those are basically the same as what I bought(got mine off amazon) to put around my raised seating. for me, the only issue is they are still pretty bright on the dimmest setting, so it's not really possible for me to use them while watching anything as the light washes out the bottom portion of my screen.
I believe you can chain a bunch of them together, they all come with their own power supply, so I suppose worst case you run a couple control/power boxes. as long as the remote sensors are both visible, both chains should react the same way as if they were directly connected anyway.
Displays: Samsung PN64F8500/JVC X35
AVR: Pioneer VSX-1018AH, 5.1 audio
Sources: HTPC(Mediabrowser), PS3, XBOX360, Wii, Sony DVP-CX995V
Control: Harmony One