mantles

This week I"m supposed to research and figure out the fireplace/mantle thing. WE decided to hang our as yet to be purchased TV over the mantle but are not sure how. Roger doesn't think we need a mantle....but really he is just unsure how to fit everything together. We're going to use our old entertainment center to hold the electronics and have put wires in the wall to go from behind it to the above the mantle position....but how high? That is my goal this week.
I HAD planned to go to the Houston architectural salvage center...but it closed in May, to find a mantle....so now I have to get one another way. So here are 2 that I found on the internet....