Welcome to the forum, Ander! I see that you've been busy.
As you said, most of us think that over or under the notes is best. That's what produces a consistent look. Fingering is placed beside a note less frequently and only when necessary or more convenient. No one objects to this lack of consistency because the exception was made logically. When piano fingering is placed beside a note, it is usually placed in
front of the note. It is placed
after a note only as a last resort.
Coordinating fingering with tuplet numbers and other markings often requires finesse. Another consideration is to reduce the fingering to the minimum possible that still provides necessary information. Your example might just be to make a point, but in actual usage, the 5 in the LH would be unnecessary, as would be the 1 under the G. Reduction in the amount of fingering can also avoid coordination issues.
I would finger the RH differently. 2 on the D, 5 on the G and then interchanging to 2 while holding the note. The pedal would hold the lower G. Then the 3 and possibly even the 4 fingerings might be omitted as obvious. If the lower G must be held by the finger, then the interchange could be to 3 or 4 and the D# played by 2.
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