Hi Andy,
Thank you for contacting Syncfusion support.
The Maps component does not support bounding box functionality. The Maps component renders tile images from online map providers such as OSM, Bing Maps, and others. We do not use or support any of the APIs provided by online map providers. We discovered that the bounding box provides the coordinates of the rectangle against the map coordinates when the rectangle shape is drawn over the map by analyzing the examples available in the provided link. We do not have this support. Please let us know, however, if this is your exact requirement for the Maps component. We will analyze the feasibility of this once you confirm it.
Regards,
Indumathi R.