I've gleaned from some of the comments that the preferred pitch is 3-1/2 to 4:12 (depending on your area of the country). But what about orientation? Assuming that the same principle of south facing is best, East and West are less desirable but will still work, and that North is a no-go. Is this true for the roof tiles as well? Is there any sort of guidance from Tesla on pitch and orientation? Thank you!