[US] I have a z-wave network of Zooz Zen04 power-monitoring plugs and Minoston MP21 non-monitoring plugs. Automatically set themselves up by scanning the little QR code, Haven't had any network drops or device failures in...3(?) years. One Zooz Zen15 high power, monitoring device occasionally (every few weeks) glitches and reports an spurious, instantaneous 5-20 kWh energy consumption