I created five brand new emails, one each for the B.Net accounts.
Since we can no longer use one authenticator across five accounts, when my authenticator eventually dies I'll have billing place all five accounts on a single B.Net.

Anyway, those five email addresses are not used for anything else, anywhere.

I'm not saying I cannot be hacked, but not using the log in anywhere is a start.
So if running Firefox +NoScript +Adblock.
So is using an authenticator on the accounts.
So is not clicking the wow related links, on my normal email (which has never had a wow account associated with it).