In my view the only reason to go with more than a pair of UJs is if something is getting in the way of the straight shaft that voucht and I have. This is often the engine leg, intake manifold, alternator, etc.
Looks like your shaft is a bit different than the one that Sylvain and I have. Any of the places you marked will do, I guess. Perhaps green is better as the shaft passes pretty close to the tube the suspension bracket is welded on (read: 3-4 mm clearance with ø25 tube). Also, it's possible that you'll have radiator hoses passing around the rack, so it's better to keep the flappy part away from these tight spots.
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