For the second instance who has the html content popping up on the map of the first instance, you can click on the hotspot and edit it.
You can configure both vertical and horizontal position through Hotspot Interactivity -> you choose the behaviour -> and you can modify position (there is also other properties like color, height, width.. that you can configure) -> then click update -> And finally save and return.
You can download our pdf documentation from this link : http://dotnetnuke.aricie.com/en/Download.aspx?DMXModule=455&EntryId=571&Command=Core_Download
For the responsivity of the module, the mouse over feature doesn't work on mobile. And also, positioning is absolute on the map.
So the module is not quite responsif, the subject may correspond to an evolution of HtmlMapMaker.