With a glossy white cabinet, is it safe to assume it doesn’t have a grain direction to consider? Specifically, I could order a vertical grain cabinet and a horizontal grain base molding and I wouldn’t see a grain to either?
Correct, the solid colors like glossy white have no grain pattern, so you can simply choose either horizontal or veridical as it will not matter. As a standard, we would recommend choosing vertical grain as this is more common (i.e. speeds up the order processing slightly).