We are currently working on a multi-location view for the location dashboard. This will be released in H2 of 2016.
In the meantime you can set up Roll Up reports to see search rankings & citations for multi location businesses.
Using Roll Up reports, you can aggregate multiple ranking or citation reports into 1 large overview report.
This is incredibly useful for those who manage clients that have multiple locations or franchises and want to be able to see all of their data in 1 single report – as opposed to having to go through to each report individually.