Changing defunct Heatmiser to Meross - wiring

[vizzo]

Just checking before I make a rookie mistake.
This is for wet underfloor heating.
Attached are
1. Existing wiring to heatmiser
2. Heatmiser wiring diagram (it may possible be to a slightly different model) This is the one that was given to us when we moved here but there are several slightly different heatmiser thermostats for different rooms
3. Back of the meross
4. Meross wiring diagram

Which wires go where?

 

[Rodders53]

Ideally:
Blue to 1 (N)
Brown to 2 (L) and 5 (Common relay contact) with a link wire (also brown)
Grey to 3 (Normally Open relay contact)

Same switching result using the existing short brown link (as it'll likely not reach to terminal 5):
Blue 1
Brown 2 and link to 3
Grey 5

 

[vizzo]

Works a treat - thank you