Not all locators come with a transducer. Some you must buy it separate. If you have a trolling motor mount the transducer on it.
I use these transducer mounts on mine - https://www.transducershieldandsaver.com/
My Bennington has a transducer mount welded on the rear of the left pontoon log. The Garmin that came on it on the console has the transducer mounted there.