Anne Miller wrote:I feel you would need to turn the herbs daily.
Also being on a stand up rack might impend the air flow.
If you have good airflow through the room (e.g., a fan blowing, or perhaps leaving them on the porch), I feel like those roller carts could work well. They're even convenient to move around to different locations where they might dry better. A lot that I have seen though have a back on one side so that folks don't accidently push the tray all the way through. I think you'd want to stay away from those since you won't get much airflow.
As far as needing to turn them daily, having an extra set of trays that are the same size might let you simply hold a full tray against an empty tray, flip, and put it back on the shelf - if that makes sense. I imagine you could move through one of those standing racks pretty quick using that method.