To be more specific, here's what I envisioned for the Scouring mission.
Six objectives scoring 4,3,3,2,2,1 like the book. Players roll off to determine who places the first objective (of their choosing). Players then alternate until each objective is placed. Players then roll for Deployment, etc. So worst case scenario, yes there are 10 points on one side, if you allow that to happen. Objective placement could be tweaked too (distance from each other, board edge, etc) to force at least some of them toward the middle of the board.
Sidebar: I just realized, if the values of the objectives are each increased by 1 point (objectives of values 5,4,4,3,3,2), that brings their sum to 21 points, which is exactly the number the primary objective would be worth for Adepticon scoring.