I prefer the “puck” style. But I have helped people epoxy skimmers and they work. The difficult part is to get it exactly perpendicular to the bottom of the boat. Since it is rounded on the bottom, it can tilt to either side and that screws up the accuracy since you are now measuring the distance to the bottom but off to the left or right of the centerline. Pucks make that nearly impossible to screw up.Also, pucks end up with less epoxy or resin (whichever you use) between them and the hull, which minimizes the tiny air bubbles that reduce signal strength. Done right, there is very little epoxy/resin between the puck and the bottom, potentially giving a bit better signal/noise ratio for better detail. Done right, a skimmer will give that same accuracy. But it is easier to do it wrong.Just my $.02, others may disagree…2008 Pantera Classic2014 Mercury Pro XS 200