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I happen to find superlatives with the structure below:
Adjective + most,
which are: the rearmost, the frontmost, the uppermost, the headmost, the outermost, the topmost, etc.
What are the general rules to form this type of superlative? Is it related to direction?
They mean the latest point reachable when you move in a certain direction:
and so on.
The point you've reached when you can't move anymore is the point the speaker is talking about.
So in general:
The "general rule" to form an "Adjective + most" superlative is, tack on most after an adjective, and see if it's meaningful and sounds right; which is how most such words were formed. There are some interesting "misformed" exceptions, for example foremost which derives as a corruption or variant of formest or fyrmest, "altered on the assumption that it is a compound of fore and most."
Most itself is a superlative of much, many, or more (but is sometimes used colloquially in place of almost). As a suffix, it lends a "most extreme" meaning, in the same sense or "direction" suggested by the word it suffixes.
