Octopus SRO 2000 INT - Rec' Water Depth?

Is this recommended water level the height for the water or the height that the skimmer should be sitting on? I'm have a hard time with this skimmer. I have a large sump and therefore the water height is 9" but I have the skimmer on a 5" platform.
 
I'm gussing the water outlet should be above the water line? My skimmer came with reccomended min and max water lines on it which are MUCH higer than 5-6". I can't understand how with the outlet submerged the skimmer WONT overflow.
 
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