Depends on what you mean by standard. Generally there are three common way to mount a transducer; transom mounted on a bracket, thru-hull where the transducer resides outside of the hull and a stem passes throug a hole in the hull, and in-hull mounting.
There are two variations on thru hull, with one being outside the hull on a fairing block, or not, and the other being essentially the same but the transducer is mounted inside a pocket that is glassed into the hull. Either way you get about the same performance out of the transducer. There are also two ways to do an in-hull mount and its one of them that you seem to be interested in. The first way, and what a lot of guys would call the standard, is to simply epoxy the transducer's face to the inside of the hull - sort of glue it down - and let it go at that. This is simple and it works but sometimes bubbles form in the adhesive or under the face of the transducer. If that happens the performance of the fish finder will suffer. A second version of in-hull mounting has you somehow build a tank into the bottom of the boat and then fill that tank with liquid and then suspend the transducer in it. The liquid can be one of many things but mineral oil is a good choice. There are also some factory kits for this type of mounting, and these often involve some sort of "tank" that is cut to match the hull bottom and then attached to the hull bottom with a sealer/adhesive. The advantage they provide is that they provide intimate contact between everything from the water to the face of the transducer. They work very well - I can attest to that. The yellow thing in the picture is a tank from an Airmar M260 transducer, the black thing is the transducer itself. In the foreground is a standard thru hull for applications up to 600 watts..