No contact from the Sales Engineers. I think this was triggered because I download the Real Estate Trial, they thought I was a new customer.
Anyway the Real Estate demo did provide some clues you can group items in RadListView using GroupPlaceholderID="GroupContainer" GroupItemCount="3", etc., which is nice.
However you then need to style the item divs. I'm doing this by relying on Bootstrap for the Responsive Design. But can I use the Responsive Design Module, for this behaviour inside a template?
I think it would be useful that Responsive Design can extent to widget templates with Predefine Styles.
So I should be able to set say "div class="ResponsiveColumn1" and this should have predefined styles and rules just like layout columns. And I should be able to configure these in the Responsive Design module without having myself to use CSS. Just like I can with normal layout columns. If that makes sense?