The Spawner component[workshop.pummelparty.com] is what you're probably looking for. It can spawn a random prefab at a random given location target.

However, if using prefab objects, the Spawn on Destruction option is broken as of right now (as noted in Known Issues). Though, it works just fine with prefab items that the players pick up. I'm hoping this gets fixed because I need this mechanic to work for a mod I'm working on.