Hey @CarlE, just be wary, those Sonoff controllers don’t have CE or FCC marks. Consider that the lack of CE marking means a lack of CE/BSI safety approval, their would need to be evidence proving conformity to various EU directives. I can assume an insurance company leaping on this (i.e. - no CE accreditation) as a reason not to pay out in the event of something going wrong.
CE marking is complex, but in essence, it’s applied by the manufacturer to say their product complies with EU safety, health and environmental requirements.