If I saw them near the surface, backs out or just under, I would start from the top down. But the best thing about adjustables is that you can cover all depths with one cast!
If you were fishing a spot that was 10ft deep and tied a rig to be an inch or two under the surface, the next cast could land in a divot or on a lump, meaning you could be 6inch down or up from where you thought you were, or even a foot or two out! How many swims do you fish that are a dead level bottom!
When I do fish fixed zigs, I always start at the longest I think the fish are. It’s easier to cut down than add on! As I say though, when it’s critical to be just below the surface, an adjustable is the only way to go to be sure. Even in shallow lakes.