I think it sort of depends on the lake. Are there skiers in the area? Because you don't want to hurt anyone. If skiers are for sure not a problem, then you can vary the height from just a foot or two off the bottom all the way up as close as you want to the surface. If it's a clear lake, you may want to keep them deep enough to keep other fishermen from spotting them. If there ARE skiers, I would make them look like a stump field and keep them all pretty close to the bottom. Good luck!