transducer mount on aluminum boat

[fmrusmc]

I want to attach my transducer to my aluminum boat but I am a little weird about drilling holes into it. And I read somewhere that a metal bracket will eventually eat through the boat. So I was wondering what is the best way to mount it without drilling? I thought about gorilla gluing a piece of a board to the back and then screwing the ducer to the board. I'm just not sure if gorilla glue is the best choice or if it will work. I know you guys are a lot more experienced in these things. Any input is appreciated.
[signature]