I'm not convinced walleye only feed up. That said, accurately placing your baits at depths within a well conceived overall spread is critical to catching.
Given your question...I would setup my spread slightly above, inside, at bottom and below (say 10ft) the bait.
Remember your sonar reports the distance from the transducer to the fish not the precise depth directly below the surface. Sometimes these distances are the same, but often fish shown are off-center or on the the extreme edge of the transducer cone. A fish off-center or on the outside of the cone is actually "shallower" than the reported depth... the amount less depends on the frequency cone angle of your transducer and relative fish depth. One way to tell is by the shape and density of the graphed "hook". At trolling speeds partial or faint marks are toward the outside of the cone and higher in the water than reported. Perfect solid color hooks are more in the center of the cone angle and closer to the indicated depth. This adjustment is a detail, but could throw your perceived depth off by as much as 6 ft or more depending on relative fish depth. This depth error is less in relatively clearer/shallower waters of eastern lake Erie vs. lake Ontario for example.
Line counter reel calibration is another way to reduce the errors in placing baits in the vertical water column.
More accurate depth placement of your baits within a well conceived overall spread will put more fish in your box.





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