Im wondering what kind of tv to look for?
IMO 4k is useless because the network where I live is bad and 1080p is good enough. I don’t think smart tv functionality is a thing to look for, more like a « what not to look for » criteria.
What other criterions should be taken?
One key term to search for is “digital signage”. Since they’re built to stay on 24/7 for years, you’ll probably need to buy another one, which offsets the higher price to an extent. If you can make do with a smaller panel, a large monitor with HDMI input is another option.
You can also sometimes find a shop that’s selling off someone’s warehouse remainder of older dumb panel consumer TVs, although that’s getting much rarer as the number of new-in-box units decreases.