EVO Home with a Thermal Store/water cylinder

Anyone using their evo home with a thermal store or with the watercylinder module?

I want to understand more on the function. I will have 2 boilers on a thermal store. I only want the controllable boiler to activate on one of 2 reasons. either I’m home and the store is below x degrees or I’m away and the house is below Y degrees (to keep from frost ETC) one of them can be controlled by the boiler controls but he other I don’t believe can be. but could if the boiler could be setup to monitor the thermal store properly.

The heating should know about the thermal store temp before it turns on and then only turn on the boiler if needed.

Not sure if that’s explained right!