Been searching for awhile and haven't found anything so I thought I'd ask you guys. Anyone know of a product that mounts a keyboard tray to the stand of an iMac? We're setting up the office to have 2011 21.5 iMacs vesa mounted. So the iMac stand will still be attached as the unit swings around, but the doctor wants to have a keyboard attached a la something like this. To be clear, we already have the vesa mount arms and are looking for a keyboard tray to attach to the imac (probably to the imac stand).