This is a dead simple set of brackets to build a rack for my wife's hair dryer and hair straightener. They should be fairly generic, so they'll probably work for most.
The wood is a standard (at least here in south africa) 22x44mm profile, and the length is variable.
There are recesses for two screws in the back of each bracket, I used 3x6mm woodscrews, but you could also use glue.
If you find that the straightener doesn't have enough spring to keep it in place then consider a bead of hotglue or something else which will provide a little more grip than the hard plastic (Maybe print in TPU?).