Vanity lighting

My electrical for vanity lights are set.  I can tell that my vanity sinks won’t align to these boxes already.  I see that there is a video entitled “Install vanity light with a plastic electrical box”,  however, there is no video there.  Or, at lease I cannot access it.  I had an electrician install these boxes and I didn’t have vanities picked out yet, so he used his best guess.  After drywall, the width of that wall will be 59 inches.  I am using two 28 inch single vanities that will but up against each other.  I realize there will be a 1 1/2 inch space on each end, but I plan to have the vanities sealed together.  Should these electrical boxes be moved before I put up the drywall?  Right now they are at 10 inch on center from each wall.  I think they should be 14 inch on center from each wall.  Bottom line, do lights have to be center above the sinks, should they be?