Ask HN: Where should I keep my recovery codes (Google account for exemple)?

Not sure if this is the best place to ask this but: Like everybody, I have alot of online accounts, which all require passwords. I have 3 google accounts and each one comes with 10 recovery codes. Now my question is this: Where should I put them? somewhere in my house? In my password manager app where all my passwords are stored? I try to secure my accounts as much as possible with different password, and 2 steps verifications, but the recovery code is the last layer of protection for an account and I want to keep it in a safe place. Thanks! Edit: word