I don’t understand the description at all. You shree balls should be shot… ok. Are they shot at once? The picture is contradictory; if they should fly in the same direction, why are the arrows pointing in different directions? Also, if you want to shoot balls, I think you’d be far better off with instantiating a ball prefab three times and adding force to it in the desired direction. It could be done via particles but it’s really not neccessary is it?
If the three projectiles should indeed fly in a specified direction, not in a random one limited by a defined cone’s space, then you use instantiated prefabs.