Hi LM, Can't think of any particular rules. Your example is an adverbial complement, so the subject and verb are inverted and no comma is correct-- which won't happen in such sentences as 'under the moon, the wet trees glowed like corposant'. Certainly do not avoid fronted phrases, nor on the other hand overuse them, but scatter them tastefully amongst the other sentences of your composition to create a pleasing variety of expression.
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