Do you want the salon table to be easily removable or not? Asking how to secure it without giving more details about how the table is built, how the base is made, and what it is made of, and what your purpose is in doing so is pretty useless.
A generic answer would be bolts through the salon sole, backed by a heavy backing plate, so that if someone were to hit the table, when the boat heels over, it doesn't get torn out of the sole and become a projectile.
If you want it to be easily removable, your best bet is to make the base with two slots that go under two permanently installed bolts and then have bolts or twist-lock connectors hold down the other side.
Of course both of these attachment methods assume that the base of the table has a fairly substantial metal plate to attach it to the cabin sole.
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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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