Stacking Anti-air Fire Directors

[Adseria]

In the dev logs, you've shown that ships can be fitted with multiple AA directors. Stacking surface fire directors in RTW1 gives no advantage beyond redundancy (as far as I know). Is this the case with AA directors, or will having multiple directors, for instance, allow a large AA battery on a single ship to split it's fire between multiple targets? Bonus question; Will there still be no advantage to having multiple surface fire directors aside from redundancy?

Side note; as I understand it, AA fire directors have no legs, and are therefore incapable of marching.

[desdinova]

Also, for late game, will there be air search radar and anti-air radar fire control as well?

[williammiller]

IIRC certain later radar techs will improve your AA fire (effectively giving you radar-assisted fire), and both air & surface search radar will exist in the game.