Hey there HH, Same problem that I always had. Here's what I have done to my boat to fix this problem. Use 1 1/4 I.D. PVC to make some rode tubes. Mine just happen to be cut 13 1/2 inches long but whatever works for you. I've learned that they can be closer together than what I have mine here. We put my buddy CrappieKeeper's at 12" apart.
If you are going to stack them on top of each other along the side of your boat a really helpful tip is to hook the hook/hooks in the hook keeper and/or foam handle then reach up and hold the line away from the rod a few inches as you twirl the rod 3 times. This will help keep the tips from catching on each other. Just grab the line and untwist the rods and you're ready to fish!