Power Service Geo Location

Hi all, 

Our organization is considering to move data into datasets in the service. However data security is a ve y important topic. We are not in the service yet. Hence all data is stored locally.

When we now start hosting data in the service aswell as implementing the gateway for auto refresh:

Where will the data be stored, on which servers and countries?

Is there a way to influencer where the data will be hosted?

How can we find out which security measures are use in the service?

Thanks!