Question for the wire experts. It seems that the Belden 5000UE 12-gauge is frequently recommended for surround runs. If I'm passing the wires through the attic and walls where they will cross power cables at least once and run parallel to them for a few feet in the walls, would it be better to use the shielded version (5000FE in Belden manual)? Also, are connectors more difficult to attach to shielded twisted pair ?