Using Robyn on subnational data

[hugmal]

Hi,
I understand MMM models are most commonly applied to data at the national level, with one measurement per day or week only.
Is there a reason why one cannot/should not apply Robyn to data at the regional level (e.g. 16 daily measurements for each of 16 regions). Would a geosplit cause problems with the algorithm?; I.e. in some of our regions we do not show adverts in some of the channels?