Welcome to the Wowza forums. So if I understand you correctly you want to be able to scale from multiple Wowza servers configured as the origin?
You could do this but you would have to pay for more than one Wowza server instance. Have you considered doing this in Wowza Video instead where it will auto scale for you?
If you’re trying to do something like Twitch where multiple people can upload a video to your app, you can do this through either Engine or Wowza Video.
I would reach out and talk to to a sales engineer to find out which one would make the most sense for you. I can share some info on scaling with multiple Engine instances for now.