Ideally, I want one webpart to rollup ALL forms for CURRENT USER that are In Progress, NOT one webpart per list. 

I need a rollup webpart for a list, to display CURRENT USERs forms that are In-Progress. I want it to display the DISPLAY form (maybe another day I'll want EDIT form). This webpart will live on a page that I will surface in a different Site Collection.  I've added the Nintex List Form webpart but the configuration always throws errors without any indication as to what the error is. I've left "SiteURL" empty per another community member's post, for the list name, I added only the letters (no forward / or otherwise) and ITEM ID is required ("Item ID must be a non-zero positive number")  what ItemID is there for CURRENT USER?   

What webpart is recommended and what are the configuration instructions?