Cool!
I checked the Shelly web pages and it looks like they are all Gen 1, including Uni and i3. Gen 2 are generally named Shelly Plus xxx or Shelly Pro xxx.
Let me know the priority order as it takes some time to do each one of these.
I’ll also be 100% dependent on you for testing, since I don’t have them myself. It would be most helpful if you have a Windows computer where you can run logging with the SmartThings CLI, which is a program you download and run in a Command prompt window. Detailed instructions are here to get that installed. If for whatever reason you can’t do that then we can muddle along, but it will just make things a bit harder.