I didn't have time to read all the responses so I'm sorry if this is a repeat of someone else. I have had great success with the 3M command strips both in hanging pictures and some wighty objects from our walls. I would double duty it and use the picture frame holders as stands and set the shelf on top of those towards the ends and maybe a couple of the velco kind one on each side of part that goes in the corner to keep it there. and If it doesn't balance well on the picture frame holders I might try a rubber band between them wrapped a couple times around the "nail" parts of the hangers. Hope this helps.