I say mount the rod holders and forget the planer boards. Since your in a 14 footer I don't think you'll be heading out with 4 people in the boat right? Planer boards are nice when you have a bunch of rods out and want to spread them out or when fish are easily spooked my the boat (which muskies are most often not). Like mentioned above, run at least one line in the prop wash, I often get hits on that line.
Have a good one