I bought the active target and installed it but was wondering how far up the trolling motor you mount the mount? I have 36v ulterex if that matters.  I was also wondering does the head of the trolling motor effect the sonar any? Looks like with the factory lowrance mount the transducer would be hitting the motor head some messing up the return some? 

I attached mine a few inches up.  I do not have any issues but I have mine on a ghost.

I've got mine up a little ways maybe 6" to 8". Maybe not helpful on the Ultrex, but Mine is high enough just the top of it sticks out of the water with the TM all the way up. I don't have any issues with it catching the trolling motor head.