I just found out about this project that makes the Sonoff NS Panel easy to use. You can buy the NS Panel for about $50 on eBay.
https://community.home-assistant.io/t/sonoff-nspanel-blueprint-configure-your-own-custom-nspanel-…
These panels come in both US and EU sizes for mounting in existing switch junction boxes.
I don’t have any yet but this is on my short list of projects. The best place to buy seems to be the eBay Sonoff store. Best prices (and the shipping location is close to where I live.)