I am not an expert by any means here, but this is how ours are set up and function. We don't have a tree, but hopefully this winter. We have 3 plastic rocket launchers a side. The reels fit with some room between them, but not a ton....I would guess all in about a 2 ft area. Our boat is not a center console but our front holder is about at the end of the rear facing seat.

When we hook up the person reeling goes as far back and to the other side of the boat( especially if it's the outside board) helps clear the lines in the event the fish does not pull the board back too far. Once the boards clear the pole person moves as far forward as possable (often with just 2 of us the person the person reeling will drive at the same time while the other nets). We use 7ft rods and the end of the pole is not beyond the rear of the boat, (if I could find 6 fters I might switch)

The fish almost always come up and in basicly in the center of boat and if not, a small wheel correction in the last 20 ft puts it there without upsetting path of the other poles, once netted, we return to course. Sometime the larger fish stay down and we neatraul to prevent the prop cutting.

As far as getting the line in the prop when turning, with the in lines running I don't know if you could turn sharp enough to get the lines in the prop. If so you would more than likely tangle many lines also.

When we get our trees I want to mount them about where our front holder is maybe father forward. I think this will help the boards pass when coming in cause it will give me more room to drop back before coming in over the inner boards by a few more feet havin all the poles in 1 spot as compaired to spread out.