Another thing to keep in mind with wireless surround systems is that most of them aren't really "wireless". In fact, they can be as much of a challenge to connect as a non-wireless speaker setup.
Yes, there is a wireless transmission from your receiver, but that transmission is usually picked up by a "wireless receiver" unit, which in turn, is connected to the surround speakers by.... you guessed it... speaker wire! The "wireless receiver" needs to be plugged into a wall outlet to power the internal amplifier, so it's placement will be dictated by the available outlets in your room.
When you also consider that for a 5.1 system the surround speakers should be placed to the sides
of the listening position (not behind, like many people assume - check out this placement guide from Dolby
), then the "wireless" solution actually becomes even more troublesome.
You wind up having to run speaker wires either from the back of the room to each side (if you plug in the wireless receiver on the back wall) or worse yet, you locate the wireless receiver on one side wall, and wind up with a short (and easy) speaker wire run to the surround speaker on the same side, but need a long (and possibly difficult) speaker wire run to go all the way around to the other side of the room for the second speaker.
The only true "wireless" solution would be battery-powered self-amplified speakers. But how much wattage do you really think you'll get from a few "C" or "D" batteries, and how frequently are you willing to change the batteries.
Of course, do a search for such speakers, and you really won't find any because they simply don't work.
There are many ways to hide/run speaker wire. If you can tell us more about the room, and maybe provide some pictures we can hopefully offer suggestions on how you could properly set up wired speakers for a 5.1 setup (6.1 won't really be much of a benefit unless you have a large room with a good bit of distance between the seating and the rear wall).