Replace analog thermostat with digital

Hello everyone,
I need a quick help. I want to replace 3 analog thermostats with digital ones. Installed, as seen in the photo, is Eberle. 3 cables, neutral, brown 230V and black 230V at the thermostat wiring. New thermostat Alpha Direct Komfort. But where are the 3 cables connected according to the wiring diagram.

Thank you in advance