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Soup:

I agree with Tedious. Just to the left of the strap in your picture is where I'd locate it. But I have a bit more room there ...

Our sterns/transoms are very similar, just the size is different.

The suggested distance from the motor ... there's a lot of different places that are "motor" from which you could measure. The important one would be any part of the motor that causes turbulence that would interfere with the sonar signal. At high speed, everything causes turbulence, but many depth finders can't keep up anyway. At slow speed (upon arrival to the fishing grounds or while trolling) the real turbulence is the prop wash, only. At slower speeds the boat is relatively non-turbulent and the other parts of the motor also glide through the water. From prop to transducer ... probably more than 15".

It would be nice to have others chime in here. On my boat, the location seemed perfect and theoretically correct. I tried it and it worked. That does not make me an expert.

As for the mounting of the transducer, proper, to the boat. According to manufacturer's instructions, I ran a straightedge along the bottom of the boat and my transducer was supposed to be lined up with that edge, which also represents a perpendicular. I was surprised at how different the correct mounting height and angle was compared to what I "eyeballed" as being correct.

For my transducer, the key was to mount so that the unit itself was not mega-turbulence inducing and that it was shooting straight down into the drink.

I like your idea of tape as a temporary measure. You could tape a yardstick or something to your bottom to get that height/angle right.

Finally, a glued on block that serves no purpose is always better than a hole through the hull!!! Plus, gentlemen shouldn't be checking out your stern so closely ...

Bill