It's all subjective, so do what makes sense to you. I change my setup around depending on what I want with me.
2 - 16" trax up front for FF, GoPro, 2-Ram rod holders, and maybe a GPS mount. All accessories fit in the trax with a twist.
On my back deck is a 4" trax for my VisiCarbon Pro. Also Hobie side rocket launchers for rod storage. More rocket launchers on my crate. I'll keep a stake-out pole, or break down my paddle and store it vertically to get it out of the way.
One comment about my Ram rod holders: the butt of the tube is solid and a couple of my rods do not drop in far enough, so I'm probably going to cut the bottom out of at least one of them and see how that goes. If I had paid attention when I was buying them, I'd likely done something different.