You can set up additional accounts, but then you can't easily switch cars or you'd have to log into the other account on your phone, and have your SO around to give you the 2FA code.
But anyway, that's not the topic here.
Best way would have been that Tesla specifically and clearly state their bank account number on all documents. But even then, you risk that someone with some background knowledge can fake an email to you with a fake bank account. If you don't have the reaction to check the bank account number with their website and a pro-forma invoice in your account on the Tesla website, you can still be conned.
Compare it to all the emails with "orders" or "invoices", or even CEO fraud in the hopes someone from accounts payable is deceived and just blindly pays an invoice.
But anyway, that's not the topic here.
Best way would have been that Tesla specifically and clearly state their bank account number on all documents. But even then, you risk that someone with some background knowledge can fake an email to you with a fake bank account. If you don't have the reaction to check the bank account number with their website and a pro-forma invoice in your account on the Tesla website, you can still be conned.
Compare it to all the emails with "orders" or "invoices", or even CEO fraud in the hopes someone from accounts payable is deceived and just blindly pays an invoice.