Many of us sew small "pockets" onto our hunting pants to perform the same as that bow holder. I have a pair with a gusseted pocket with an area just above my knee that is perfect for use when standing on a treestand.
I usually use a 6" square piece of carpet remnant that I throw down on the ground to place my bow tip on(when sitting ground blind)and hold the bow upright against my knee. I shoot lefty so I have been holding the bow on the left side with my knee inside the string, the bow facing string left arrow tip right, and my left hand just kinda making sure it doesn't go anywhere.
It is upright and right there for when I need it, and the tip is not in the dirt.
ChuckC