Open Marker Infomration

Is it posible to have a map start with all the Marker Information boxes shown by default?

I’m using the plugin to display different locations of a restaurant chain, and I would like all of the markers to be open showing the information when the page loads.

Alternatively is it possible to have one of them open? Or make a button in the most that can open one of the information boxes when its clicked?

Thanks in advance.