Thanks Irmamar, a ¿locución? and here i was thinking it was a 'preposición' jeje
What I'm really trying to get at is what does 'por' add in the kinds of examples that I've listed. It must give something extra than just using detras, delante etc.
As an update and for future reference for anyone else that may be interested here's a helpful reply that I have received from another source:
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"Por" often refers to the location through which something happens, including places to be crossed and insertions (like this sentence).
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