Debbie says her plates have a protruding rim underneath, what can she do?

If the rim is no deeper than the thickness of the Eazy Hanger AND a minimum 70mm from top to bottom of the rim, it will work.

If either of those two are not applicable you will need to glue a spacer under the Eazy Hanger (and under the red spacer), so as to bring them at least flush with the rim.