I recommend installing 2 of the largest plates on each side of the boat, I also grounded my arch and hardtop to each plate on the port and starboard side with #4/0. Use wide foil to couple them to the SSB antenna tuner, in addition this gives us additional lightning protection in bad storms. Between the last plate cut the copper feeding the SSB antenna tuner and install 6 to 8 .01mfd capacitors. You want to do this in a dry area.
Bill