Midship cleat: deck, sliding or toe rail and the last, why so expensive?

Looking to put a pair of cleats midships to aid single handed pontoon mooring. Bolt to toe rail, slide one on the genoa car track or just bolt though the deck? A deck mounted one will be awkward to fit and get in the way. The toe rail one - easiest to fit but is it strong enough, and why is it 3 times the price on a deck cleat?

You could fit a posh retractable one like those seen on Grand Soleil yachts.
 
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