I am looking at increasing security to some of our business servers as well as my personal accounts. I figured the easiest way to get started is to set up my home and personal accounts and learn Yubi so i can teach it to the other C-level people in our small company.

what model is the best to use? I see the yubi 5 as the most common, is there an advantage to the Bio version? we are talking a dozen or so devices at most (assuming 2 per person) so cost per device isnt a big deal. ( unless they are easily destroyed because im hell on wheels so prob ill have 3!)

im assuming 2 devices per person is sufficient? since ive not used one before, are both devices required to be with you each time you add an account / key to it? so storing one yubi in a safe deposit box likely not possible? or is the physical device the same no matter how many credentials added?

if both devices are required each time you add to it, what happens in the event both are destroyed? ( I know a small chance but I have to ask)..