Transom mounted transducer placement

[BermudaTriangle]

Hi guys,

I really should be posting some pics of my boat I will in the next week or so. Pulled the trigger and got a 23 CC i/o with a 300 volvo. I have been bringing the boat back to life and a week away from launching. Just picked up a garmin package today. Want to try and get it installed tomorrow but wanted to check in with the experts first on the best placement of a TM transducer that works best for reading the bottom at speed. Measurements and pictures welcome! Sorry for the post I checked a few older post but a lot were thru hull details. Thanks in advanced!