For the AV cable run, you could consider using those brush opening fascia plates. That way you can pull more cables through the channel when tech moves on.
Something like this:
https://www.google.co.uk/search?q=brush+opening+fascia&safe=off&client=ms-android-orange-gb&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiLjLbjwv3RAhXhJsAKHXlBBoIQ_AUICCgC&biw=360&bih=518#safe=off&tbm=isch&q=brush+opening+fascia+gang&imgrc=_
@mashton started
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For the AV cable run, you could consider using those brush opening fascia plates. That way you can pull more cables through the channel when tech moves on.
Something like this:
https://www.google.co.uk/search?q=brush+opening+fascia&safe=off&client=ms-android-orange-gb&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiLjLbjwv3RAhXhJsAKHXlBBoIQ_AUICCgC&biw=360&bih=518#safe=off&tbm=isch&q=brush+opening+fascia+gang&imgrc=_