Not sure about the rules for your area, but can let you know some in SA.
You can install them on any structure with tilt frames as long as you get council approval. This will still entitle you to the recs.
You want to get max daylight hours as possible. In SA the preferred is North facing.
If you want to install more than the 2.6kw system you can fit prob better of getting seperate systems(ie 2 2.6kw systems) because if you do have a split system facing different directions they can work against each other(this may not be the case for all inverters but apperently is for many) or even cause damage from overheating.
If your roof is just over 12m and you can fit 2 rows (say 12m.5 X 4m) you would be able to fit 24 sharp 215W panals which is just over 5kw.
Hope this helps
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