Two sessions leaving from the same address look like the same person to the destination site. If the site rule is one account per person, separating the accounts starts by separating the addresses.
The practical count
One account, one dedicated address, one browser profile. Shared does not fit here, because someone else uses the same IP and the site lumps the two of you together.
This does not get around any site rule. It serves testing and authorized operation, where the accounts are legitimate and the separation is organizational.