I used the center of my side pane of glass as a starting point and went from there. I now have one 40 3" towards the back and the other 3" towards the front. 1 is about 8" down from the top of the tank and the other 12". 4'x2'x2' 120 gallon tank. I also point the solid section of the wet side towards the top of the water to allow the flow to spread out.
Once you get them where they work best for you be sure to use the cord ties to secure the dry side from falling. They don't land softly if they come disconnected.
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