Here is an idea, contact a custom carpenter or the Villages Woodworking shop and discuss the possibility of taking your smaller fireplace and having extensions built to a suitable width. In this manner, you will get exactly what you want width wise as well as storage wise.
Another idea, most new TVs can easily be hug on the wall, we have a 70 inch unit wall mounted 6 inches above the "TV entertainment console" and used some pictures to hide the wires. If you decide on this type of installation you can use any size fireplace. Just some random thoughts, send me a PM and I can send you a photo of our installation.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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