Hi!
In being accepted to multiple colleges, I’d have to apply for students with families housing with my wife. Do you apply after being accepted to the college and before entering the college for Fall 2019? Is it possible to apply to multiple colleges for this kind of housing just in case one of my applications is declined? What if two applications are accepted? Can I choose one out of those without causing conflict?
Usually you apply for housing after you have deposited and confirmed your intent to matriculate at a particular school.
My advice would be to contact the housing offices where you are applying to confirm that they guarantee family housing for incoming students. You may find that some schools on your list do not and will refer you to off campus apartments.