Most devices are in the category 3, except for BLU that are currently in 2. I have almost 1 of everything they make and I did set up the BLU ones using 2 with their app, I did not test to see if their app works without Internet, but I doubt the BLU can be configured without their app.
Don't recall if Shelly's default to 2 or 3 but I like that you can flash em to tasmota for a gaurenteed 3.