Random map generation and random spawn points.

Hey peeps.

So, I'm working on a random level generation (C#). I have this set up nice with prefabs placed randomly together instantiated as clones.

My tiles are children of 1 empty game object, which holds the script to generate the level and also tells A* pathfinder script to "scan". After the level is set up I delete the parent of the prefabs, which leaves me with my level in a nice square as it should.

Now I have placed 1 empty game object in each prefab as a child. This empty G.O holds 3 zombies as children.

I am having scripting issues and my pea brain is not working as it should. I want to spawn a random amount of zombies for each spawner(which is the empty GO holding the zombie types). I would like to have them spawn around the GO and for it to also choose a random zombi from the array containing them. No respawns are needed, I also need to scan the map for A* before instantiating the zombie clones.