There is a way you can see all of the products for which you have multiple locations in a report!
First, you'll want to navigate to the Location table.
After that, you'll want to click the SKU column, hit the "Advanced" dropdown, and click "is not blank" like so:
After this, just sort the SKU column by ascending or descending as you like and this will show you all the locations associated with each SKU.
You can pull this data into a report by exporting into Excel, and you can also save this filter as a Smart Filter to look at for future use inside Infoplus.