Main powered smoke alarm with main powered zwave router

Since new houses have main powered smoke alarms I thought it would be useful to have one or more smoke alarms with a main powered zwave to extend my zwave mesh.
The FireAngel has an option for a zwave module but that one is still battery powered and doesn’t work as a router.
I find them hard to find but maybe you could help me.

It seems like Popp has one but that one has a separate adapter. Since we have a build in wire box is not so pretty to see.