I wouldn't use those cleats. Aluminum is a lousy material for cleats IMHO. They are subject to fatigue and fairly vulnerable to corrosion as well.
If the wall is fairly thick, say two-to-three feet, and it were my boat, I would drill fairly large holes and drop in stainless steel or galvanized threaded rod that has the bottom bent into a j-hook, and the top spaced to fit a heavy stainless steel mooring bit like this one:
That would probably be more secure than those small cleats. Make the threaded rods fairly long and the chance that they'll pull out is minimal. BTW, if you're using cleats or mooring bitts, you need to put some sort of rub strake down on the wall to protect the rope from chafing against the concrete.
If the wall is fairly thin, less than a foot thick, I'd agree with Hartley and go with ringbolt or u-bolts with rings attached, that are through bolted using a fairly heavy backing plate.
BTW, it is generally a really stupid idea to tie up to coconut palm trees. Coconut palm trees have very shallow root systems and generally aren't all that sturdy in resisting high lateral loads.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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