The switching actuator does not natively support Apple HomeKit. Only the Shelly Plus 2PM (Gen4) with Matter compatibility is currently intended for integration into Apple HomeKit, which can be connected via a Matter hub. The 2PM Gen3 currently has no official HomeKit firmware or native support. Although there are unofficial ways to integrate older Shelly devices into HomeKit via third-party software such as Homebridge, this is not official and requires additional effort. The 2PM Gen3 is not suitable for direct and official HomeKit integration.

We currently pay more for the 4-pack than for the individual packs, which we buy in bulk. This is why the sales prices are currently like this.

I use various shellies with openhab via MQTT. Since Nymea supports MQTT, I would say yes.

This is a double pack. Thank you for letting us know, we will be happy to pass on your feedback.