How to handle multiple user interfaces with shared logic within subscription limits?

Hi there,

If I set up an interface and want to use it individually with its own access for each client on an own database buth with the same logics, is each copy/acces of the interface considered a utilized interface? In that case, I could quickly reach the maximum interfaces in the premium subscription. Or can I use one interface as a base for each individual client as much as I want?

Thanks for help