Question about Shelly Plus 2PM

With the right wiring this is no problem

@donrabi - this only works if the Shelly remains live. If the voltage is interrupted by the changeover switch, the Shelly can no longer be reached and it is no longer possible to switch on the lamp at the socket. Or am I seeing something wrong?

Yes, without any problems. Simply install at the switched socket and lead the switched contact to the shelly.