I am using those old black flat-bottom hard-rubber trays (8x10 size). I've been putting the plate in the hanger with the plate emulsion on the bottom side. Hopefully to prevent any particles that may be in the chemistry from settling onto the emulsion; and to prevent effects of waves on the surface of the chemistry from possibly causing uneven development. I'm only using 32oz of chemistry in the tray, so the chemistry is not very deep. The hanger loop is being used as a handle to move the plate through the chemistry. I move the plate up-and-down and side-to-side keeping the motion as random as possible. Nothing quick or abrupt, just slow smooth motions. Of course anyone that tries this hanger will need to experiment. Also, since the hanger's hooks should prevent the emulsion from touching the bottom of tray, that is, if the bottom of the tray "is" flat, I see no reason that stand development can't performed also. That's something I want to try.
I'm leaving it up to the community to determine if this thing is truly functional for their own purposes.