IMO, using a backing plate on these handles would reduce the chance of a bolt pulling through the wall later on. Even 2 or 3 inches square with the bolt in the middle distributes the stress over a much larger area. Our roof latch on the 3324 uses a backing plate on the ceiling for that reason.
Backing plates are very common on boats, particularly sailboats where the bolt loading can be quite large. Look at it as cheap insurance.
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