Using AudioLevelObserver with many producers

What is the best way to use AudioLevelObserver for many producer (for example 1000) on 1 router to reduce server load. Use 1 observer with maxentries - 1000, 1000 observers with maxentries - 1 or 100 observers with maxentries: 10? Or is there better solution? What is the recommended maximum amount of maxentries?