I like Mermaid A/Cs. Have installed them in 3 boats now. I have a 41’ sundeck with 2 16k units and that works well for us. The problem for you is 3” duct work is way too small. Mermaid requires a 6” duct and a 6” vent within about 5 to 6 feet of the unit or else the unit will tend to ice up. I suspect that is true of any manufacturer since physics apply to all of them. In our sundeck we have one unit under a dinette seat and one in the bottom of the aft cabin hanging locker. I would look around your boat and see where else you might get a bit more room to mount one and run proper sized duct work. Only having one 16k unit is marginal in a boat your size. Having undersized duct work is marginal. Having both only one unit AND undersized duct work will make you very unhappy with the results.
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