Best webcam for my K-3rd grade digital learning pod?

I'm a teacher leading a digital learning pod for kids age K-3rd on zoom. We've been having a grand time, except kids are constantly moving outside the frame. I'm looking for the best hardware/software so kids can jump up, lie down, bounce around during class and still be seen. I want to find a setup similar to facebook portal with awesome sound/video quality and face-tracking. Basically, like facebook portal, but not facebook portal, since it's not compatible with facebook kids messenger, none of our kiddos have facebook accounts and parents are concerned about privacy. I'd also love for kids to be able to screen share and use IOS apps on their device. Any suggestions of a great webcam, new tech for remote teams that could be used for kids or any other devices would be warmly appreciated.