yep, sitting face down on the sump directly at the water. only probably 3 inches from it.
now, i have also done this in the past and will likely try it again but it is a lot more expensive route. fans are 20+ each and the tray is like 30, plus you have to wire it yourself. not sure how even a two fan rig would fair on a 210 but i will know this summer. if not back to good ole reliable desk fans - http://www.melevsreef.com/acrylics/fan_tray.html