Typically a cleat on any Boston Whaler boat will have been located in an area of the deck or hull where there is embedded reinforcement in the Unibond hull, or the cleat can be through-bolted and have a backing plate.
The typical folding cleat requires that the vertical posts that form the cleat must be able to descend into the deck to allow the horn of the cleat to become flush with the deck or the surround of the cleat assembly. This means that you must have sufficient area BELOW the deck to drill deep holes into the hull to permit the cleat to descend into.
Whether or not this is practical on a particular boat, in this case your ALERT 17, will depend on the present location of the cleats and how much space exists in the hull below that location. Also, the mounting fasteners for the new cleat must also land into the reinforced embedded material in the hull.
Or, you can use a surface-mounting style of folding cleat, which will not require any deep holes to be drilled for mounting. For example, see
Whitecap Folding Cleat - 6745https://defender.com/en_us/whitecap-folding-cleat-6745?utm_id=147314937780As long as the above example of a folding cleat will fit and its mounting screws will land in the reinforced area embedded in the hull, or you can use through bolts and a backing plate, the installation of this type cleat should be relatively easy.
("Oh, easy for Leonardo!" -- Dylan Thomas in his short story, "A Child's Christmas in Wales" referring to assembly of toys on Christmas Eve.)