My 50" TV with corner feet fits good. A larger TV would need a pedestal mount.
Yes, the hole is in the back thru the deck surface, nicely hidden. Back corners for the shelving areas.
No, this will alter the assembly of the unit and there would be no spot to put part # 21, which supports the firebox. Thank you for your interest in our products.
You may place a TV up to 100 lbs on it. Thank you for your interest in our products.