I am using the pi hole for DHCP, maybe you just have to turn off the DHCP server on the att modem.

I know what we’re going to do today!

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Are you sure about that? I’m using the official AT&T fiber modem (Nokia white oval) and a pi.hole for DNS. I do remember needing to change a number of settings to get it to work though.

You probably want commercial displays. They’ll cost a bit more, but they’re also designed to run 24/7 (think the screens they use in menus, signs, etc) so they could probably last forever as a TV.

We’re still 100% Windows 10 so it hasn’t moved (yet).

At my job I have to explain to fully grown adults where the Start menu is on a regular basis.