Schluter®-DITRA-HEAT-E-RS1 Smart thermostat installation

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Schluter DITRA-HEAT-E-RS1 Smart WiFi Programmable Thermostat
It features a sleek design with a mirror-finish, and third-party integration with popular voice and home assistants to easily include floor warming into your smart home capabilities.

[@MyFighter2000]

where to connect the ground on the Thermostat? How can the GFCI work without messureing to the ground?