One additional and often overlooked suggestion - position the front tip of the roof box a little bit back (guessing 2-3 inches behind the start of the sunroof) so at speed the air is deflected over the box by windshield and not get trapped underneath (if the front of the box was too far forward), else you will hear loud humming noise from the box.
Since there is a weight limit and its same for all sizes, I would get (actually got :P) a L instead of XL or XXL for the sake of suggestion above.
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