You can stack these straight on top of one another or at an angle on top of one another. I put mine together at an angle. It helps a whole lot when you are retrieving them. Hopefully you can see this in this photo.
If you're interested in getting some of these, they are called Ultimate Pen Storage Rack and I got mine at Hallmark Scrapbook and here is a link to them. I'm not advertising for anyone, just wanted to share something that worked for me.
Thanks for dropping by today. Donna has gone back to work and I'm puppy sitting Buttons. She & Max love this. We love your comments and visits. If you have found something that works for your marker storage, please share with us. God Bless You!!! Peggy