Wireless 2nd monitor help

So I use my 50" TV as my main monitor but sometimes I want to use the computer while we watch TV. I want to wireless connect the monitor, which is an AOC I2269Vw. I have a GeForce GTX 970 (tho I have been mulling an upgrade)
Anyone have any suggestions on what wireless unit to get? I will not have perfect line of sight, and if possible I would like to hide it behind the tv which is just above the mantle.

IR needs direct line of sight correct? I am TOTALLY lost when it comes to this type of stuff lol
 
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