This may be the easiest, best, Sanctuary Formation in the game at present.
Atropos, Marlowe, Mars, Devana, and Tomoyo
These Heroes are fairly easy to get—with the exception of Atropos, and maybe Tomoyo—and do not require to place high in events, or win one of the lottery type games.
These Heroes all give bonuses to all Troops, including vehicles. These Heroes with a million Taxis can be a formidable force on your wall.
Atropos is difficult to get as she is only available through certain events, Tomoyo may also be difficult, as she can be found in the lottery events, however she can also be purchased from time to time with offers.
Atropos is an amazing Hero because she is the only one that give boosts to sanctuary based troops.
Importance of Hunt Formation
When you take your troops out hunting either Zombies or Zombie lairs having a good formation with Heroes that match your strongest troops, and the troops that you are dedicating your gear bonuses to, is an important step in maximizing your damage overall.
It is also effective in the Pit, and raids on player sanctuaries. You should always upgrade your troops to the maximum tier that is available based on your HQ level. This will allow you to use your might to its maximum potential.