| All the transducers should shoot through a glass boat hull so long as they're installed in he correct place (exception being the SI).
the "correct place" is where the hull is single thickness...thus the question i assume.
i can't speak to the Ranger you're looking at, but other the boats on which i've had shoot-through-hull transducers (4 Tuffy, 1 Skeeter) all have multi-layered hulls over most of their length, but thin down to a single layer at the very back near the transom.
put the transducer as far back as possible in the "sump" for the bilge drain and you'll probably be fine.
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