1, 2 and 3 bikes in no problemo. If packing them like this, I would use one of those cheap yoga mats in between each bike.
Photo 4 is the
rail I bought after seeing it recommended on here. Only issue is you need to loosen the bar bolts and turn the bars down. No hassles really, just a minor inconvenience. Think the bar was originally designed for MTB.
PS - all the road bikes are big frames!