Many cable manufacturers now make armored fiber with however many strands you need. No problems installng this during prewire unless literally chomps through it. It looks like electrical MC wire that they use in commercial buildings with a smooth coating over it.

The bees knees I’ll tell ya. Install a 6 strand and use a pair for av distribution, pair for network and a spare pair in case whatever.

We’ve gone done to doing 1 of these plus 1 rg6, 2 cat6 and speaker cable if necessary.