I bought a commercial stainless steel sink that came with 2 detachable drainboards. I cannot use them due to lack of space where I have the sink located. You should be able to mount on another sink with a little fabrication to existing sink.
Would be great on the for a fish cleaning station. It also comes with 4 legs.
![Image](http://i328.photobucket.com/albums/l342/wadeleebenton/IMG_1629_zpsexu3jwer.jpg)