p griffin is correct. Pushing any speaker system with an underpowered amplifier is often more dangerous than overdriving speakers. Just be realist about volume. If you are trying to shake the walls of a 30 by 30 foot living space - its not going to happen with this system. Many $500 plus amplifies have built in protection circuitry: they will shut down when hot. If driving this system too hard, you should notice that the speakers are clipping. Its not difficult to recognize. If so - back off the volume.
No, they mean surround like a satellite around the earth. You can buy a wireless unit to make them wireless. Wireless are more for just the two back speakers. But one thing to know as that they will still need to be plugged into the wall and wires will still have to go to the back speakers if you buy a wireless unit. Like a small box that will give the back speakers power and a signal will be plugged into the back wall with wires going to those back speakers. But with a wireless unit the wires will not have to go from the stereo/power unit to the back speakers. One note, I own these speakers and they are very awesome. The wires were easy to hide. Hope I helped:)