Good.
If the board has 4 zones, you can double it to 8, so from 4 sensors you can install 8.
I leave some links that can help:
https://www.youtube.com/watch?v=LRi4Ko5pfLI&
https://www.youtube.com/watch?v=WmkJcPT_BRE
https://www.youtube.com/watch?v=LPP_ogXk0rs&
Greetings.