23lbs zinc anode spacing/location

[mrcasper]

Good day,

I need to place 23lbs zinc anodes on a barge. I'm going withe the convention

Total surface area of anodes = 1% of wetted surface.

Now that gives me the total surface area of anodes, 57sq ft, but how do i adequately space these anodes? is there a convention for this or a rule of thumb or something I can refer too?

Thank You
Justin