FWIW, when I did my overhead console mod, I marked the attachment points, then cut an access hole in the headliner near those points.
I then used silicone adhesive/caulking to bond 1/4" x 1 1/4" dia. plywood discs that I made with a hole saw (of course squares would work as well), to the top side of the headliner.
This allowed attachment with short, course thread drywall screws, at the stock (console) attachment points.
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