Is the prayer of the imam valid over more than one funeral, lined up in a single row?

The Sunnah is for the deceased to be placed in front of the Imam, so he places the men first, then the women, then the children. However, if they are arranged in a single row, that suffices, even though it goes against the Sunnah. In summary, praying over the deceased in the manner mentioned is valid, although it is preferable to place them one behind the other.