For best protection and traceability, use separate email and Roku account for each device. Bit of a faff to set up and manage, just keep all the details in a file or book. Use email addresses that make it easy to link to unit number.
Remember to remove payment details from all accounts after setup before setting up next one or (better) link to a reloadable payment debit card with minimum balance, or use the "nocc" signup link if you can find it and it still works. Also worth setting up channel add pin on each account before triggering guest mode on the device for ultimate safety.
You may find that setting up accounts with different emails may trigger antifraud protection on payment card, so choose card carefully!
Not a Roku employee
