Three-factor authentication? What's the third factor? Something you know, something you own, and... maybe something you are (biometrics)?
https://stripe.com/guides/strong-customer-authentication#wha...
(Although only two of the three will be required.)
Adding two secondary accounts (both an SMS and an email) could warrant the name
Now, it's likely that you do the right thing given the chance, but I know for a fact that my dad keeps the keys to his safe in his filing cabinet, and the keys to his filing cabinet in another filing cabinet. It's not really an extra layer of security.