Trim tab placement

[4shore]

I know it's been talked About before but my situation is maybe a bit more unique. I am getting rid of my ugly bottom paint and doing a white epoxy from the chines down. I have this chunk of starboard to mount my transducers to and it won't allow me to install the Bennett bolts 3" from the chine. How important is this spacing? How do these tabs react when they are spanning the longitudinal chines?