Every time this question is asked, it comes down to the definition of the bottom edge set. IF a body gripper is placed against a vertical edge, I only consider it a bottom edge set if the trap is completely submerged. Less than 25% of my blind sets fall into that category. Of those traps that I categorized as bottom edge, 60% of them produced mink this year. So thats around 15% of my total mink catch this year came from what I consider bottom edge sets.
Many mink were caught in half submerged body grips against a vertical edge, and another pile of mink were caught in dry land body grips against a vertical edge (top edge sets). Then another good producer of mink were the small tributary streams where a body grip was set in the middle of the stream since it was so narrow. And yet more mink were caught in dry trail sets through stream-side vegetation. And a few more mink were caught in pocket sets, although I don't use them much. I didn't do the calculations for these other types of sets mentioned.