Should he do anything special to the two fire places while they are being built (i.e.) add holes or openings for a future tv install years later without taking away from the current look. I have a separate entertainment room.

Put in conduit for the A/V cabling, Ethernet separated from the power lines. A 120v box and low voltage fitting for the A/V cabling to the screen should also be strategically placed.

A cabinet space for your components would also be helpful.