Surface mount drip trays are the easiest to install. Only one hole is required through the countertop for the drain line. The drip tray is secured with a nut and washer attached to the drain pipe. Surface mounting means it is mounted on top of a surface's face. This means if you ran your hand along the surface, your hand would run into the object that was mounted.
We also have surface mounted drip trays with no drain hole. This means at the end of the day or the end of your pour, then you would lift the surface mount drip tray from your surface and wash out the excess beer or other liquid.