Like this holder as it allows for paper notes and pens to be held. Only drawback is when you put on a shelf you cannot access the back slot. Works best on the cabinet or desk top.
I bought this organiser to tidy up a corner of my desk that kept collecting documents and cords and it holds everything I need it to nicely (as well as some things from the other back corner of my desk). Great size and short enough to fit under my spare monitor arm.