I have two similar-design exhaust/cooling fans installed in a cabinet that houses a cable box, wireless router, telephone converter, and UPS. The fans plug into USB ports, don't make much noise at all, and keep the four electronics devices plenty cool. I think 110v units would be huge overkill for your set-up, especially if you already have the table wired for USB.
TV will probably have a USB port
Well, I went ahead and ordered a couple more fan setups from Amazon. I ordered a single and double fan with USB hookup. Not sure which one I'll use, but the one I don't use can get plugged into my PS4 system to keep it cool.
The more I thought about it, if I used AC, sure I'll have a power strip in there, but I would hate to have to lift the table topper up each time to plug in the fan. If I plug them into the TV, hopefully it won't power the fan until the TV is turned on. I checked the TV specs and it says one USB 2.0 out. I'm assuming that will provide enough power? And I'm assuming it's not powering when the TV is off (I'll have to test it to make sure).
Boy, still keeping the set-on-top TV box as an option for this build... I really think it's a much cooler (baller) setup to have it flush mounted, and allows for books and such to spill over onto the screen (as space will be tight otherwise), but it's certainly creating a lot of logistical issues to make it happen... Fans, Grommets, Concerns about damaging the poker felt... etc....
Here's a video of someone who made a box... it'd be cool, but not as cool as flush mounting...