Handling Large Temperature Variations in a Single Room

[Freddyleddy]

Hi,
I’m using the better thermostat integration in Home Assistant to control the heating in my living room. The room has 3 separate TRVs (Bosch TRV II with Z2M integration), but the background temperature varies significantly across the room with up to 10°C difference due to external factors.

-One radiator is near large south-facing windows (much warmer).
-Another is in a sunken area (much cooler).

I want to manage these TRVs effectively, ensuring balanced comfort without overshooting due to the natural temperature differences and risking heating up the radiator in the already warm part of the room. I used to use the Bosch Controller that automatically managed this, but I'd prefer to fully migrate to Home Assistant.

How should I configure better thermostat to handle such large temperature disparities within a single room?
I guess it would be possible to just set up 3 different TRV integrations in better thermostat, but I'd like to control them as one unit. Both for ease of use for the household, but also to ensure efficient heating when necessary.

Are there best practices for multi-sensor setups (e.g., averaging, prioritizing/excluding certain sensors)?

Any advice or examples of similar setups would be greatly appreciated!