"Neo-W"; a rather well known bunker design which is always a great option due to its relative cheapness. It is also the smallest META piece which includes howis and 2 AT garrisons (of the ones I know of and use). On the other hand infantry has a hard time supporting these structures since it's really hard to get on top of them. Make sure to have a variety of ways like trenches and other bunkers that lead to the outside of the base for ease of use.
Music: Instrumental #2 Revisited
by Gillicuddy