Linking a bank account is necessary to fund the investments, and so that we know where to send your rental income!
At this time, we can only connect to one bank account per account. We hope to add the ability to have multiple accounts linked in the future.
If you wish to fund investments from 2 different bank accounts, the best solution for now is to create 2 Arrived accounts using different email addresses. Then you can fund one investment with one bank and the other investment with the other bank.