Thanks for your question! Yes, potentially, you could do this. I would set up the Echo units on different Amazon accounts, and then use “Drop-In” calling to view the camera on the Echo device near the children.
However, this is not a perfect solution – the camera on the Echo Show is not very wide, so if the children are outside of the frame or the camera is not positioned correctly, you won’t be able to see what’s going on. In that case, a dedicated child monitoring system might be a better fit.
Hopefully that helps you!