Problems with running wires through dry wall
I am trying to wall mount a TV. In order to run wires inside my dry wall, I bought this product http://www.legrand.us/wiremold/at-home/cord-organizers-and-covers/flat-screen-tv-cord-covers/cmk70-tv-power-kit.aspx#.UMrYYm8vaSo. Unfortunately I didn't foresee two problems:
1. My dry wall has insulation inside. Would it be safe to run a electrical cable inside dry wall which contains insulation. Can a spark burn the insulation?
2. If you look at this video demonstrating how to use the product http://www.youtube.com/watch?feature=player_embedded&v=ly4yIW1gfts#! the upper mount of the assembly has a depressed single plug point into which the TV plug is supposed to go. Unfortunately I ordered a roku which I want to mount behind the TV and that means I need two plug points instead of one. Are there any socket extensions that would fit in the depressed mould provide more than one outlet?