My 2017 Ford Edge has the same problem - the cargo net clip broke when I pulled the cargo cover back and it jumped out of the track. Same story - $500 replacement of the rear quarter panel.
However, I was able to repair the clip with a good gel-type Super Glue and it seems as strong as the unbroken clip on the other side.
I still would like to replace it with a new one, and buy a spare - so if anyone comes up with a source. Please let us know.