Can I run more than one business from one Surge Marketing Hub account?

Yes. 

However, your account will have one name, so make sure to pick something you're okay with everyone seeing. Your name is often a good choice. Also, the invoice numbering will be in one sequence, and the branding, such as colors and logos, are going to be the same across the account. If all of those constraints are okay with you, then you're good to go.

However, if you’d like to add a second account, you can do that at a 50% savings.