I've got a porch I want a ceiling fan in,the ceiling itself follows the roof pich which is 1:12. The height of the ceiling is 90"-7'6" where the fan would be installed. A fan that mounts flush on a flat ceiling would obviously be at a slight angle, would this last with the wear on the bearings? Has anyone mounted one like this? The other choice is one with the pivot point and short pipe which hangs down approx. 12" which might cause a contact problem.