My workplace uses Samsung TVs. I found a trick to let it run without connecting to WiFi. On the screen where it asks you to connect to a network, just click right like you wanted to skip it and it will skip it even though it doesn’t say that’s an option. YMMV though, I can’t say if it works for all TVs.

Better yet, don’t buy a Samsung TV but this might come in handy if you happen to have one.