Based on AnEpicPotatoe's NZ_insanity I bring you NZ_Spore. Based on impact, it begins as segregated spawns, one in a small courtyard and one in the main room downstairs. they battle through the rooms against the oncoming hoard to reach the main upstairs room where you can activate the power ( a turret ) It has the same weapon drops as the original and follows the same NZ_Survival game type.
Players 12 - 16 as starts with 5 zombies
Gametypes Flood NZ_survival
Map created by AzureXPD and Absentduckling3
On Absentduckling3's file share
Gametypes coming soon but I presume you already have it as its popular