Clad in carefully woven raiments designed to help them vanish into the background, Waywatchers are almost impossible to spot. This means that the enemy suffers an additional -1 to hit modifier when shooting at them. In addition, Waywatchers are able to sneak up extremely close to their foes. Waywatchers are deployed at the same time as Scouts, and can be placed in one of two ways.
Source: Warhammer Fantasy: 6th Edition
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Either place them exactly like Scouts, but with no minimum distance between them and the enemy, or place them in sight of the enemy (even in the open), but more than 12" away from them.