For the Standard Plan, a maximum of 2 Brands can be purchased as add-ons on the Standard Plan, with no limit on the Team Members you can add and manage. However, there's no limit on the number of Team Members and Brands you can add and manage on the Professional plan.
On the Agency Plans, you can add a package of 5 additional Brands and Team Members. There's no limit on the number of Brand and Team Member packages (5 add-ons) you can add to your paid subscription on the Agency and Agency plus plan.