Multiple npcs attack a build

I have a multiple npcs and i want that npc attack one build, i have the ai to get the closest point between the build and the npc, but when i have for example like 20 npc attack, they put some in the front and the npc on the back cant reach the point to attack because all of them get the same point to attack, i want the npc go around the other npc until the get the mesh of the build.

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