Triggering smart plugs with MP2 relay?

Is there such a thing as a gadget like a wireless remote control that can be triggered by the inverter relay to switch on and off smart plugs and switches that are also controlled by Alexa? I have an immersion heater smart switch that is linked to the smart life app and to Alexa, but it would be great if the MultiPlus-II could also control this switch via the relay. Is thete anything available?

Please describe why an inverter should switch a single or several devices ‘smart’?
You could switch the multi, but does it make sense the other way round? For the activation of e.g. a water heater, this can be done via the assistant and / or relays …
You have to build the necessary external controls yourself … Integration of NodeRed and or a Raspberry controller with additional functions.
The Multi is primarily just an inverter …

The idea is to switch on the immersion heater via a wifi smart switch once the batteries are full, to divert the extra solar to the hot water tank, or to switch on a space heater automatically.
The inverter is too far away to add hard wired connections to the immersion or space heater, so a smart switching system would be ideal if it can be triggered by the mp2 relay after setting up an assistant.

If you have a CerboGX then you can do this with a Shelly device and NodeRed relatively cheap.

Do i jave to use node red with the shelly? Or will assistant work? Node red is too mind boggling to me