What's best: boil eggs in advance or just before use?
By your definition, I would cook them all at one time.  From there you have a couple options.  


Leave them in the shell and peel when needed.  This keeps out a lot of the air which extends the shelf life to 2 weeks, but can dry them out a little making the texture a little harder.
Immediately peel and dry them as best as possible.  Put them in a Zip Lock along with a dry paper towel on the bottom to catch any extra water and condensation.  Remove as much air as possible.   The texture is much better, but your shelf life if approx. 1 week and is a little smellier. (also can put zip lock into a covered container) Lol.  Food stores now sell eggs this way.


Either way you may want to let them sit on the counter long enough to take the chill off, so it's not as hard. For me it doesn't matter, I can eat them any old way.  LOVE EM!