Unfortunately deploying static weapons in Arma3 implemented very poorly.
Except that it has no special animations, the deployment is not at the location of the backpack, that is first placed on the ground. the AI deployment will always be a not precise. the difference between the position of the backpack and mounted weapons can be > 2 m!
https://www.youtube.com/watch?v=pJQHRNzR560&feature=youtu.be
Thus AI subordinates do not place arms exactly where pointed out by the commander and this complicates the exact location of the static weapons. This seems not a big problem, only if the deployment of static weapon is necessary in an open field. But if the placement of weapons is necessary in more narrow places (such as the corridor, the doorway, between the stones, etc.), then problems arise!
**BIS Please teach the AI to place the weapon exactly at the location of the backpack. **