So, we wound up bringing in an excellent cabinet guy to shore up the California Closets structure after the California Closets installation was complete.

First, he cutout the sheet rock along the wall just above our shelf. This cutout extended the width of the cabinet and around 8" up from the top surface of the shelf.

Then he laid a 1-1/2" thick shelf atop the California Closets shelf cut tight to left and right sides of the cabinet and butting up against the studs revealed on the back wall. That shelf was fastened to the California Closets shelf.

Then, he inset a piece of 3/4" plywood - around 6" high and running the width of the cabinet - across the studs revealed on the back wall. It's that piece of plywood that holds down the back of our shelf when the rack is extended (i.e when the rack base applies an upwards separation force due to the cantilevering.)

We put in our SRSR-2-16 today. As we were loading it up with equipment, making the component interconnects and attaching the structured wiring, I pictured what a mess it would all have been without the SRSR. What a great feeling to know we did this right.