I was warned by an experienced marine diesel mechanic that plastic strainers inside the engine compartment are risky because they get brittle with age and the engine heat greatly accelerates that process.
Getting it outside the engine compartment, away from engine heat and above static waterline is a good compromise. I actually considered that option with a plastic strainer, but inside the engine compartment provided the best access in my boat, so I went with bronze.
Keeping salt water away from the engine is smart. Not a problem here on Lake Michigan.
