I was wondering if there are any actual rules or strong preferences about where to place left-hand fingerings in a score. From what I can tell, it seems to vary depending on the arranger\composer\publisher. Some seem to prefer putting them to the left of a note wherever possible, some always above, some in the most convenient place.
I guess the main goal is to get the fingerings in a manner such that they can be read without over-cluttering the score, but if there are any actual rules or guidelines on this, I'd be curious to know.
Life is too short to be perfectly in tune.