Of course the correct way is by placing the peg on the foot side (and the down side, not the top).
But DP hangs them by the top of the leg side , and thus a peg mark could be visible.
Like on the photo, but only one side, not both.
To be fair, hanging by the foot side could possibly lead to holes (doubt it), and by the top could (maybe) dry them faster.
Let me know if IABU (I'm not) and give me more arguments pro-foot side - the correct way.