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Could be rust on the brakes since they don't get used much (regenerative braking doing it instead). I tend to hear it after the car has gotten wet and been sitting for a while as well. We have 2 CMaxs (2016 & a 2017, both bought used in 2018 and 2020) and they both make a scrapping sound when moving slowly with the windows open. I tend to view anything both cars do as 'normal' and don't worry about it.

Came standard on our 2013. You can likely get one from a wrecking yard.

My guess is that the tires are a bit stiff and it takes a mile or so for them to regain flexibility. Just a thought.

Wire colors change mid-way between the Digital Audio Control Module and the speakers. The DACM is in the instrument panel on the left (driver's side) of the car then the cable comes out to Connector 237 (C237) which seems to go under the center console before heading to the rear speakers. There is one wire that has a different color I'll list both ends. Signal DACM Speaker Left Rear+ Brown-Green White-Green Left Rear- Brown-Yellow Brown-Yellow Right Rear+ Brown-White Brown-White Right Rear- Brown-Blue Brown-Blue