Crimar30,
If you mean the how of it, I think you got real good answers on the other thread. If you mean the where of it, that can be somewhat variable.
Most have them on the starboard side, at a flat strake portion of the hull, with minimal turbulance causing protrusions ahead of the location. Run a search for "transducer" and you will find lots of information.
If you need more info, let us know.
Codfish