Suggestions for running cables for surround channels
1- using the walls is a better idea than running them through the floor
2 - external trunking is nice if aesthetics are secondary - less drilling / hammering
3 - use good cables, as it's hard to change
4- best to avoid cable ties, but it doesn't matter so much for surrounds
5 - use a lead wire tied round the cables, so you can pull them out and lead in a new one if there is damage or other issues
6- running a duplicate length is nice, but expensive and may not be need
7 - using some kind of trunking inside the wall / ceiling is nice, but beware of vibrations / trapped dirt causing noise
8 - typically for lengths under 50ft, even 16AWG is sufficient, and smaller sizes for shorter runs.
The surround cables use don't need to be expensive, there are many options:
Monoprice 12 AWG Wall-rated cables
Belden, Canare etc also serve well, just visit LHS in SLT.
I also used QED 79 strand and Micro to good effect.
I have no financial interest or other interests in any of the items / events I write about.