Jamboard
We had an old Jamboard from the Twitter liquidation. You can get them for about $300 a pop these days because Google has EOL'd them and they're kind of useless. They do work as TVs but the default stand is awful for this since it takes a lot of space, and the software on the thing isn't very good for this.
Stand[edit]
We bought this stand off Amazon. The Jamboard has a 200x600 VESA pattern which that stand deals with easily. However, the stand expects the VESA pattern to be on the back of the monitor, not on the wall plate that the device attaches to. The VESA standard uses metric screws and the ones you'll want are either M6 or M8 (since they're the thicker ones).
The M8 screws that come with the stand are too big to fit through the holes in the Jamboard wall plate, but the stand also works with M6 screw bolts. You'll need four M6 flat washers and four M6 nuts to fit onto the bolts.
Hardware Driver Support[edit]
Supposedly, the Jamboard will work as a touchscreen if you connect it to a Windows PC. I have a spare Dell Optiplex 3040 that I was hoping to use for this purpose but it doesn't seem to work. I get the MTP interface to transfer files and so on, but not the HID interface that allows one to touch the Jamboard and have those register as touches on Windows.
However, an HDMI connection is all you need to get sound and video on the screen. The board is capable of 4k 60Hz, but I could only get 4k 30Hz on it which is fine because we're using it as a TV.
Peripherals[edit]
I just attached a wireless mouse, but I also bought one of these mini-keyboards to see if that would be better. You do have to type in passwords and so on and it's nicer with a keyboard than with an on-screen keyboard.
Software[edit]
I tried out some of the home-theatre software like Kodi and Plex but to be honest, just plain old Windows is the best way to do things. It has a Netflix app, an Amazon Prime Video app, and there's always the browser to fill in the gaps.
Conclusion[edit]
I wouldn't recommend someone buy this device in order to do this, but considering I had it, I think it was worth it to do this. It looks like other people on Reddit have reported the touchscreen working so I'm going to try with a couple of other cables and computers to see if it's an idiosyncrasy of the specific hardware I used.