Creating a server-based TM in a specific location via the GroupShare API

Is it possible to create a server-based TM in a specific location/organisation when using the GroupShare API?

The example POST data for the API call doesn't show a property which would specify any such location. Is it expected that all TMs will exist at the Root Organization?

And what if we assign a user access to create TMs but only on a specific (i.e., non-root) organisation?