I have a pare of there storm boots and have used them for several years.  The drain holes are at the arch.  When you are getting in the canoe and you hold your foot up behind you your toe is down and holds water.  After you get in the canoe if you hold your foot over the edge to drain  your heal is down and it holds water.  If you put them flat on the bottom of the canoe the water runs out.  I don’t think they get the idea of drain holes. Useful drain holes are in the toe and heal.
MagicPaddler