No clue how position impacts your AA units, FWIW.
Per the dev diaries:
- LAA shoots fighters that are attacking their own formation.
- MAA shoots fighters that are attacking their own formation, or a formation
directly subordinate to their own formation.
- HAA shoots fighters that are attacking any allied formation.
http://aurora2.pentarch.org/index.php?topic=8495.msg109914#msg109914Let's look at a simple force structure, with multiple brigades(front-line) per division(support), and multiple divisions per corps (rear echelon).
- LAA in a brigade will attack fighters that are attacking that brigade. Ditto division or corps. They will not attack anywhere else.
- MAA in a brigade will attack fighters that are attacking that brigade. MAA in a division will attack fighters that are attacking the division itself,
or any brigade subordinate to that division. MAA in a corps will attack fighters that are attacking the corps itself, or any division subordinate to that corps,
but not brigades that are indirectly subordinate to the corps.
- HAA will attack any fighters that attack any unit anywhere in the force structure. They will prioritize their own unit and subordinates, but are not limited to them.
So basically, use LAA in units that expect air attack(generally brigades), MAA in the parents of units expecting air attack (generally divisions), and HAA anywhere you like. HAA at the corps level is good if you want to keep it safe. However, HAA at the brigade/division level is quite practical too, since every unit can cover every other unit. Because of the large size and cost of HAA, I probably wouldn't put them on the front lines until you're up to SHV/UHV sized units, because otherwise you're just building glass cannons, but you can if you like.