Johny,
You won't need downriggers in western basin. I use 8oz bottom bouncer when trolling by flatlining off the back holders. I use one or two smaller boards (Church boards) to move baits away from the boat. If I need to run 3 lines each side, I usually have a slide bite diver in the back and 2 boards out to the side. Even 3 boards each side is fine. This system works for me for 15 years now.

In Central basin, you might use the downriggers but, I still use the bottom bouncers with regular success.

Rickerd