Does anyone else grow on metro racks? I do and I am looking for trays that will contain spills. I have the 48" long , 18" wide racks and have been able to find the liners but not something that will actually contain water from falling on the racks below. My plan is to have a tray that is able to contain water but have a drain on a low end so that it empties into a drain. Anyone have any ideas?