Look into commercial displays.

Lemminators. The first were here when the fediverse was created, but since July 1st redditors are becoming Lemminators too: Judgement Day.

This was my experience as well. I could barely maintain a lasting connection using mobile data. Especially bad during commutes when everyone on the road with me was connecting to towers with priority over mine. The price was amazing though and the online service/support was great.