[Oxymoron]

I have a four foot coralife fixture and am using the mounting legs as well.
What I did was eyeball it and tighten it while flipped upside down on the ground with a screw driver. Then with someones help we picked it up and placed it on the rim of the tank. It wasn't a tight fit at first but after taking it down and readjusting the screws on the mounting legs two or three times I was able to get a good and snug fit.
It looks pretty sleek and low profile with the legs and I would recommending tinkering with it a bit to see if you can get it to work for you.
Sorry I can't post a pic as I'm out of town at the moment. I'm sure if you google image searched it though you would find a few pics.
Hope this help and grats on the new light.