I'd be more inclined to go to the dollar store, buy a package of 2 thin cutting board mats, set one aside for template use, then make my own "quilters boot" using my rotary cutter and cutting mat lines, then marking it with permanent marker. lol Yeah, I'm cheap. I can find much better uses for my $10! lol
Actually, I just fold up binding at the corner, then set the edge of my seam ripper where I want the fold and pull the binding back down. Perfect every time, no extra "tools" needed!