Do you have active surround speakers? If yes, you will need to have cables & power point for them at the place you are going to place them (in addition to the wireless kit).
If they are passive speakers, how are you going to send power via wireless?

We have all (most) been through the process of thinking that we can't run wires for surround speakers but now most of us do. The bottom line is once you know how good your system can sound, you will find a way