Don't mean to pop your balloon.
I have the larger Aquafuge II Large for a year now. Its hangs on the back of the tank but supported by a shelf attached to the wall to help support the weight of the water - 50lbs worth.
The area which hangs on the tank is BULGING ! Yup BULGING. If not supported, it would have fallen off months ago.
have you thought of other options ??
Just sharing my experience with a fellow aquarist.