I recently installed some "puck" type lights in a friend's kitchen. They were LV and from IKEA, and really cheap, that's why they got them. They each had a back mounting plate, and a white lamp/zip cord to a transformer/plug. A couple of them had 2 lights per cord & transformer/plug. Because the cabinetry had gaps(approx. 1/2" to 1") between each unit, but the trim was even and flush, I ran the cables between the cabinets up to the top surface, where I installed some switched receptacles. I used small white plastic staples to fasten the cord on the bottom of the cabinet til it entered the gap and went up to the receptacles. I'm not sure if fastening the cables for that short distance comes under 400.8 (4), but I think The whole installation was neat and safe. The lights were only 12V, 20W max.
