Cool! I did a similar thing with 4x4 tablets, after connecting all 16 of them to ADB and a single host I was able to automate most of the stuff. The I just created 16 virtual screens on sway with 16 VNC clients and streamed it all over Wi-Fi as a test, but Wi-Fi worked so well that I did not look for more efficient solutions.
For that period my PC had 19 displays, 17 of them over VNC and it was glorious. I could either do something on all of them, or dedicate each for a different purpose/program (music, htop, calendar, clock, ssh sessions)
Though dealing with all the hardware was quite annoying - some throttled, some had connectivity issues, others batteries would not hold charge and so on.
For that period my PC had 19 displays, 17 of them over VNC and it was glorious. I could either do something on all of them, or dedicate each for a different purpose/program (music, htop, calendar, clock, ssh sessions)
Though dealing with all the hardware was quite annoying - some throttled, some had connectivity issues, others batteries would not hold charge and so on.