Need advice mounting transducers to transom

[GoneCrappieFishing]

I have finally after almost 4 years of searching picked out a new to me boat to replace the one Ive fished from for ages and I am setting it up now with my Lowrance HDS transducer on the back and the LSS-1 transducer as well but I am unsure as to exactly where I should locate them on this particular boat. I know what the book says for the transducers but it don't say anything about a boat with a transom as this is. As you can see, its got three different sections to the back end of it. I do know I need to put one on one side of motor and the other transducer on the other side, as I mounted them on my old boat. I also am told there is a plate you can purchase from BPS or maybe somebody has an idea of something they did so I do NOT have to drill holes into my boat. Right now it don't leak a drop and I would sure love to glue a plate on to mount these two transducers to that will hold them and I wont have any issues... Any advice is much appreciated..........GCF