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Belkin Official Support - Wiring your Wemo Wi-Fi Smart Light Switch, F7C030
troubleshooting smart switch installation - Home Improvement Stack Exchange
LNL WiFi Smart Light Switch, Alexa Smart Light Switch with Remote Control and Timer, Compatible with Alexa, Google Assistant and IFTTT, Easy Installation, Neutral Wire Required (1 Way 1 Gang) : Amazon.co.uk:
How to wire a smart switch
Kasa Smart 3 Way Switch HS210 KIT, Needs Neutral Wire, 2.4GHz Wi-Fi Light Switch works with Alexa and Google Home, UL Certified, No Hub Required, White,2 Count (Pack of 1) : Amazon.co.uk: