Yes, you can hire multiple freelancer from one job post, but I'd advise posting separate jobs if the job scope and requirements are not the same for each task. That will allow you to manage freelancers much more efficiently if you require them to have different skills for different tasks.
If you're hiring multiple freelancers, please make sure to check that box before posting the job. Once you hire a freelancer don't check the option to close the job post, so you would keep the job open and be able to hire additional candidates later.
Let us know if you need further assistance and check the client resources for more advice and information.