thank you very much for your reply! They worked fine for 2 years now, I hope they wont fatally fail. In the future I will switch to known brands :)

I use severeal of these Zigbee plugs that are announced to manage up to 3600 watts but your comment made me rethink my choices as I use them on washers and my espresso machine… https://de.aliexpress.com/item/1005005734493134.html