just ordered a set of four of these. alot of pro's they look to install easier and don't remove alot of material during installation. with a backing plate and nylock nuts would seem to be a stonger install over pop up cleats. no water drainage issue either
I ordered the 334-4 4 1/2" cleat with no visible screws
http://www.acconmarine.com/p-23-folding-cleat.aspx