Can H1B and H4EAD go for dropbox stamping separately?

I am on H4EAD and my husband is on H1B. We are both eligible for dropbox for stamping. I filled out our DS-160 and the payment receipts are under one login name on the ‘Apply for visa and book appointment’ website. We are both traveling to India on different dates.

  1. Can we drop our papers separately (mine on June 6th and his on June 16th) or will it have to be together?

  2. Can he drop papers for both of us? I think i will have to be there for ten printing right?

  3. If we can drop papers separately, how about common papers like i-797? Will i get it back within ten days so he can drop them with his documents?