I just did the nutsert installation for the top latch nuts. It worked! The link to Mike Fockes instructions was imensely helpful.
https://sites.google.com/site/mikefocke2/randrcenternuts
I bought a good quality tool from amazon. I did a practice on scrap metal.This tool was up to the job. The included nutserts are steel and set firmly in the existing opening. I was able to use the factory bolts as this set has both metric and SAE. It was worth the $42 to do it right. I am sure I will use this tool again somewhere.
WETOLS 14" Rivet Nut Tool, Hand Rivet Nut Tool with 7 Metric & Inch Mandrels M6 M8 M10, 1/4-20, 5/16-18, 3/8-16, 70pcs Rivnuts and Blow Carry Case - WE882
$$42 delivered overnight.