Power sockets
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 - We need 'without zero' devices
 - We have round wall boxes (holes). So, the standard Xiaomi/Aqara wall mounts with rectangular enclosure do not fit.
 - There also quite small and there is little chance also to add small reles (like Sonofff)
 - Though, it seam there even smaller options which might (or might not) fit (e.g. fibaro, but zwave)