While every fan tray I build is custom made to fit a particular sump, this one took more time and a little imagination to fit one customer's needs. This bracket will fit on a rimless sump, nestling down on the front wall and the inner partitian and stay there. I added a front and back piece to hug the spot so it won't be going anywhere accidentally.

It holds two 120mm fans, and is made of 1/4" clear acrylic. It actually took more time than it should have, but that's the nature of creativity versus a cookie-cutter product. I kinda like it. :)