The center area surrounded by cars (X,Y) can be both a good and bad place to camp. It is too bad we have to shoot all over 360 degrees directions when we don’t have a good control of the zombs approaching paths.
They will choose their way to get to us on a basis of factors below;
(1)our current location
When we camp at X/Y, it’s easier to survive when we control them to come from as upper paths as possible. That is, blue path rather than red one in the picture. For each spawn site, the conditions in which they prefer the blue path are like below.
(A)- Either player is in (X)
(B)- Both players are in (X) or (Y).
And also both players have (E3) footprints as a newer one than (E2)
(C)(D)- Both players have (E3) footprints as a newer one than (E2)
(E)- always they come from the top(not sure)
(F)(G)- Either player has (E3) footprint as a newer one than (E4)
(H)- not sure
(I)- Either player has (E3) footprints as a newer one than (E4)
And also either player in in (X)
In short, always enter from (E3) and keep standing X/Y (one in X, the other in Y). Then most of the conditions above would be met.
More better to leave footprints (E2) then reenter from (E1) to lead (A) spawns into better path(not sure).
In this way we can concentrate them mainly at our upperside, and force them to walk longer so that we can get enough time to kill.
Large bosses cannot pass through narrow paths except DMs. We can lead them to S1-S3 in the pic below and they’ll be stuck there.
We can shoot other zombs safely while they are stuck, but be careful because they sometimes slip out especially when they are in fast movement.