If you’re adding the widget to the viewport you can just SetPosition to cursor coordinates. If you’re adding the context menu to canvas, use AsCanvas to get the slot and then SetPosition.
It’s literally what you said:
So click on inventory slot, create
widget, put to mouse location.
Just make sure you add it to the viewport or a container that is already visible.
@SupDeity - it’s about context menu, not tooltips.