[Blind-sysadmins] setting up 2fa?

Hello, To those of you who use 2fa on your accounts how did you get it set up? Most setups I've read about seem to indicate that you have to scan a qr code which periodically changes so your second factor can generate a one-time use key, problem with me is my computer has no monitor attached, I've got it running headless. I'd like to secure all services that I've got with 2fa, is this doable without a monitor? Services include: ebay yahoo amazon audible linux/bsd secure shell access linux roundcube webmail Thanks for any pointers. Thanks. Dave.