Shared Reports

We have only just started looking at Power BI as a possible solution for our reports.

We have written our own EPOS software that is being used by a number of different clients' businesses. Each one will typically have their own SQL database hosted locally in their shop.

We are hoping to be able to design some standard dashboards/reports and then share them with each client that agrees to sign up to our reporting solution. We would only want each client to be able to connect to their own database though - I guess this means changing the connection string as the report is run. (Some users would have a few databses to choose from though - i.e. regional managers of different shops.)

As changes are made to the master reports, we would need these to replicate to all the people with access to that report. We would not want to have to make the same change for each client's workspace.

We are just wondering if this sort of thing is possible in Power BI or if we have mis-understood its purpose?