FWIW, Back when I bought my 2011 2SS and wanted to have PPF applied, the local installer recommended doing the area most vulnerable to rock chips, the front facia, the mirrors (since they stick out so far), and the area just in front of the rear wheels (the gill area), so that's what I had done.
When I bought my 2013 ZL1, I had the same areas done as before. The front facia, the mirrors, and the gill area.
I am also using factory mud flaps on the rear, and front mud flaps from ZL1addons.com
It's now 7 years and 42k miles later, and I still have no chips on my rocker panels even after taking the car to several casual track days.
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