Like others have said - I strongly recommend mounting a plastic/marine board to the transom area where you intend to mount your transducer.
The plate mounts with a couple small screws and some marine sealant/glue like 5200 3M.
I've used 5200 on numerous applications below the waterline on numerous boats and have never had so much as a single drop of water in there. It creates a permanent waterproof seal.
At some point you will either want to adjust your transducer location or height and likely change out and/or upgrade your transducer and securing into a board (and not drilling more holes into your boat) is the way to go.
Do it once - do it right. Don't poke any more holes in your transom than you need to.
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