transducer location - was oil bath...
I think it is hard to beat a nice "short run" installation under the galley sink.
It has lots of advantages and only one "dis", it's already tight in the galley.
On the plus side; power is right there, the data cable run is short, it is possible to mount it aft in a nearly useless and filthy space, it is near the center line and thus almost for sure going to be reading the bottom.
Your milage, nautical and otherwise, may vary.