just look at the bottom of your hull, you want to find a spot where there's little or nothing to introduce turbulence (air) into the stream of water where the transducer will be.
you also want the transducer to be as close to the lowest point of the hull, so the depth readings are accurate
you don't want it too close to the prop though, or the prop may induce turbulence (air)
typically, you want the transducer about 12" to the starboard side (the right side if your facing the front of the boat) of the prop & mounted to the transom
BUT if there's something in the way or something that will cause turbulence, like strakes (ridges or indentions) on the hull or something, then you'll have to find another spot
you want the transducer to be about a 1/2" below the bottom of the hull so it stays submerged on plane.
it can even be 1" to the left or right of a strake or other turbulence causing feature & still read, you just have to make sure that no air gets to it
you'll find, that you have to compromise, the lowest spot, usually has a lot of turbulence, the spot with the least turbulence, usually isn't the lowest point. personally, i'd rather have it read bottom @ full speed so i always know depth, and if that's not the lowest point, then i just have to remember that my depth reading is actually 4" off or whatever
the lowrance on my flats boat reads bottom @ 43 mph, so it's possible if you find a good mounting location
with float pods, i assume the corner where the transom meets the pod extension, is probably going to have some turbulence, so you'd want the transducer at least 1" toward the prop from that corner, but if that's super close to the prop, then it may be no good