Hi James,
Thanks for using Syncfusion products.
We can't have Summary rows in a desired location. It will be added only at the end of the Grid(next to the last row) and also we have an option to have the summaries in the GroupCaption.
Please refer the browser sample from the below link, which illustrates this:
http://www2.syncfusion.com/samplebrowser/grid.grouping.web/samples/2.0/summaries/summaryincaption/cs/SummaryInCaption.aspxPlease refer the below link for our online documentation, where you can get more details on this:
http://www2.syncfusion.com/ug_63/gridweb/default.htmlPlease let me know if you have any other concerns.
Regards,
Raji