How to run exq standalone

So I am trying to run an app on Heroku and run exq as a background worker. I did manage to add exq and run it in the app itself, but this would just make exq run the tasks on the main app. I’d like to try and run exq as a standalone app via a Heroku worker and then just call it when needed on my app to not block the main thread.

I saw this but it didn’t really help as apparently it doesn’t work. I don’t get any errors or logs but I don’t achieve any tasks either. Someone also commented that to the person who answered the main thread but didn’t get a response.

My setup is a normal dependency and application in mix.exs and for the config:

config :exq,
  name: Exq,
  host: "",
  port: 6379,
  mode: :enqueuer,
  namespace: "exq",
  concurrency: 500,
  queues: ["email"]