You can have up to 8 live/real accounts with XM.
For additional accounts, there is no need to submit documents again, you can open multiple accounts through XM members Area.
If you are going to go through the account opening process to open multiple accounts, make sure to type same personal details and same e-mail address.
You can also open more accounts by using different email address for registration.
In this case, please proceed from the below link.