Multiple dashboards sharing same format - how to implement it easily?

We have 20 online stores, and they are in the same server with different databases. We want to have a dashboard for each of the store, and each dashboard contain 10 visualisations.

So, instead of creating 20 dashboard, and total 200 visualisations. What are the preferred way to maintain all the dashboard easily? i.e. I can just create / update / delete the visualisation just in one stores but not in 10 stores?