Good luck...
I had 50 free range turkeys this summer, and they keep the chickens off the back porch, they took it all up themselves! LOL What a mess, anyway I found the most effective way was every time they got settled in I went out there with a platic garbage bag full of air and spooked them off. After a bit it seemed not so worth while to be there and they came much less often, but did not totally stop coming.
If they have shade and quiet of their own I agree, it might work better. It was hot and dry and the back porch was a heaven of cool shade, I could hardly blame them, but the barn was nice too, so I kept scooting them that direction.