We didn't do this with mine, but I'd say drop them all by 10mm before they're even on the car, once bedded in quite well you can go about changing them to what you want. They barely drop at all after the bedding in process so gives you plenty to play with!
Just make sure the damping is same all round and that the rear extensions are connected fairly tightly, went 16 clicks on all for mine.
You can twist the strut to lower/higher to your preference, mine will hopefully be finished after work this week along with discs and pads I have to fit