The filter causes lines to show up in the water column on mine. I'd center it up, left to right, between the strakes. Don't mount it too close to one or it will cause interference. In the pictures it looks like you are holding it closer to one on the left, than the one on the right. They really work best when mounted dangerously low below the hull. I have mine mounted where the line on the ducer, the one where the top and bottom half are joined, is level with the bottom of my hull. A buddy of mine has the exact same boat I do and his ducer is mounted in the same exact place that mine is, except his ducer sits about 1/4-3/8" lower than mine. His imaging is much better than mine.

I'm going to take my filter off and silicone a water hose screen, dimple side in, into the end of the livewell fitting where it comes out of the transom. I can't take credit for that idea. Got it from a guy on crappie.com

This is the screen I'm going to install:

https://www.amazon.com/Gilmour-Meta...NL&preST=_SX300_QL70_&dpSrc=srch

If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land. 2 Chronicles 7:14