You can hold a maximum of 10 funded accounts in total, with a maximum of 5 Elite plans inside that total.
Up to 10 funded Prime Accounts, or
Up to 5 funded Elite accounts, or
Any mix of the two, as long as the total stays at 10 or below and Elite accounts stay at 5 or below
Example: if you already have 5 funded Elite accounts (the Elite maximum), you can still add 5 funded Prime Accounts, for a total of 10.