I bought my 2017 SS used about 6 months ago. It is black. It has a good bit of rock chips on the rear panels in front of the rear wheels and on the front. Otherwise the paint is in pretty good condition.
PPF is not a bad idea and if you can do the entire car it is not a bad idea.
For keeping the paint looking great, I find that Meguair's Waterless Carwash works great. Easy to clean, won't scratch anything and the only thing that touches the clearcoat is microfiber towels.
I have been using the Meguair's for the last couple of years on both my cars and it keeps them cleaner longer, water just beads right off, it saves a lot of time, and my cars look great the majority of the time.
Beyond that, I would not agonize too much over it. If you drive the car, it will get dirty and it will get imperfections in the paint.
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