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Normally from what I know is between 5 and 7 degrees, no more.
Not only it looks better, but a horizontal or drooped down spreader may have a tendency to slide down and cause failure.
Modern spreaders have turnbuckles installed and therefore they will not slide, so tilting them up, does equalize the angle between the lower shroud and the upper shroud, and reduces stress in doing so.
To me, when they are tilted upwards also makes it look really SEXY!!!