TV Mounting and Connections

I am planning on mounting the TV in my living room above the fireplace, but have a few questions/concerns. My current setup consists of a Samsung LCD TV (not a smart TV), a Samsung blu-ray player that is wired and used to stream Netflix, etc., an older home theater system that is wired and I wouldn't mind parting ways with or replacing, and DirecTV cable that is likely going to be replaced by AT&T service.

I don't have any issues regarding mounting and getting a power source behind the TV. I'm most concerned with the best route to have cable and a streaming source connected to the TV with little or no wires exposed. I have done a similar setup in the past and just mounted a shelf just under the TV to house the devices, and ran the wires vertically. However, this time I'm leaning toward having the devices in a closet or shelf away from the TV. Any suggestions and/or specific product recommendations? Also, does anyone know if the wireless receiver offered by AT&T would work in this situation?

Thanks in advance.