the setup on the DPA site with omnis just outside the curve of the body is one i have used many times, but it is more appropriate for a classical piano sound. typically for jazz or pop piano, you will want closer micing. most pop work is a pair of cards place right over the strings just behind the hammers, about 6-10" above the strings - methods vary from XY, ORTF, NOS, or spaced pair. for jazz, i typically will find a compromise between the more distant micing for classical and the very close pop setup - i would suggest a NOS pair inside the body of the piano, about 1 - 1.5 feet above the strings behind the hammers, and sort of pointing toward the players knees.