I tend to think this is one of those things were spending the $35 or so on a propagation tray, dome and rooting cubes might be a better idea. Its very simple, tried and true and you can do 50 clones at a time in one if you want. And you can easily keep your humidity in that 75-85% sweet spot for clones. And they come with rooting gel.
If you decide to go that way I would be glad to answer any questions you have about setting up a propagation dome.