Hi. Thanks for your suggestion and your usage of Yi/Kami cameras. You have some set up there with 20+ devices. Way to go you.
In regards to using the multiple live view I do know that this is something limited to those on premium cloud subscription with Yi/Kami and I think at the moment it is for four cameras concurrent.
What I’d suggest is to email Yi Support with your suggestion and see if they can help you further.
Support Email:support@yitechnology.com
@Steven_Kami may also be able to comment further.