[talking about Gen2 / Plus 1PM]
Ah, wanted to chime in and say something about a setting for notifications. I think you can change the prefixes so your shelly's would be filterable, according to the configuration page:
topic_prefix, putting that to 'shellies/<number>' should work (?).
MQTT | Shelly Technical Documentation
The MQTT component handles configuration and status of the outbound MQTT connection. Here, you can find how to configure your device to connect to an MQTT…
shelly-api-docs.shelly.cloud
The setting for notifications is false by default, but you found that one. status_ntf