Battlefield Dune Sea/Cliffs that block vision&make archers miss

I dont know why in my map the vision block doesnt work ....*(

With cliffs or with vision blockers ? If it's an other destructible you're using, you must know that the occlusion height isn't influenced by the Path (a 10x10 path wont block vision around its whole size, only on a 4x4 basis (size of a tree)), meaning you have to put a shit ton of them if you wanna block vision on long distances.

@GolluM_KoMe thank you for the help!