Belkin Official Support - How to install your Wemo WiFi Smart Light Switch, WLS040
Amazon.com: Wemo Smart Light Switch with Thread - Smart Switch for Apple HomeKit - 3 Way Switch Compatible - Smart Home Devices - HomeKit Light Switch - Apple Home - Requires Neutral
Wemo Switch Review | Smart Home Reviewer
Belkin Official Support - How to install your Wemo WiFi Smart 3-Way Light Switch, WLS0403 in a 3-Way configuration