spawning gameObjects into different formations

I was wondering how I might go about spawning gameObjects in different pre-specified formations. I am trying to spawn 5 gameObjects into a random formation: i) 5 objects aligned horizontally across top of screen, OR ii) horizontally aligned across middle of screen, OR iii) horizontally aligned across bottom of screen, OR iv) V formation pointing upwards, OR v) V formation pointing downwards (example attached). Then, after a button press, these gameObjects spawn into another formation (chosen randomly). Would I start by creating an array of formations somehow? And how might I go about spawning my gameObjects into these formations? Any help would be greatly appreciated!