Django Celery - use a Django DB broker for production for small applications?

Question

I have seen this before, but have not found a reliable answer.

I have a very small production application (200-500 users who rarely hit the site) on Heroku.

I have a few tasks, but nothing crazy. Will I work fine with django_db as my broker?

I use only one celery worker per hero with three parallel processes (for reasons of hero memory).

The use of several workers (may lead to the execution of messages several times).