I used 2x2's for a frame, and cut a center slit in the 2x2's to slip the 1/4" peg boards in. I mounted mine long ways, and let the 7' 2x2's as legs to stand up behind my machines.
Then after this is built I laid them down on the patio face down. then I laid a 2nd peg board on top of the frame. Take 2 -1/4" dowels and stick them through both peg boards and slide the top PB up to get the dowels at an down angle. Remember this if the back of your free standing PB. Now secure it to the back. When you turn it over to the front side your dowels will be slanted up!
I went to Lowes and bought a bunch of dowel sticks and taped then in a bundle. Lowes charged me 50 cents a cut, to cut through the bundle. I cut mine every 6". This is so much cheaper than hooks. Just put your cut dowels through both PB's it will hold great, and they are strong. my pics will not loads, sorry