ours are mounted the same as above pictures we used starboard( if you don't have any dollar store plastic cutting boards work well, or walmart) we have scotty on swivel bases stainless hardware including fender washers.
I too like the bait tank set up, how does the boat move when Its full? I would just be concerned about too much weight on stern as we have both batteries back there fuel and 2 motors. would be nice to have a live bait tank tho.