How to structure AWS Elastic Beanstalk production and staging environments with web and worker tiers?

I'm planning on transfer an application from Heroku to AWS Elastic Beanstalk. On the Heroku, I have two different applications, one for staging and the other for production, and both have their web and workers dynos.

I'd like to setup something like that on AWS EB. I've read the difference about Web Tier and Worker Tier, but here goes some questions:

Do I setup two different applications for production and staging? Or the same application and two different environments? If so, I would have to create 4 environments, two for production web/worker and two for staging web/worker? What's the correct structure? I'll use the same Rails application for web and worker. In that case, will I have to deploy them separate or is there a command to deploy both environments together?