Good tablet for kids for Plex?

I’m looking for a tablet that I can buy for my kids, so they can watch Plex (connected via a hot spot to my phone) while we’re on long drives.

I don’t need any bells and whistles, nor anything hugely expensive, as they won’t be using them that often.

Does anybody have any suggestions? I was thinking of fire tablets but I’m not sure how well Plex would run.