The BRIC* countries for example may not just wag their puppy dog tails and follow "big business" though. Those countries may prefer tech that is more...
My ranch has similar corners and the issue is made worse by the splash shields there to prevent water from the valleys from overshooting the gutters....
What a difficult place to deal with run off. We have an L shaped ranch with the 90 degree corner just to the side of the front entrance to the house....
I represented Fujitsu in a the six New England States for 15 yrs ending in ‘11. Ask the factory this question and it is no, no and no. But, yoou will...