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I purchased an open-box LG microwave oven which did not include the upper or wall mounting templates. It seemed silly to spend $20 for a piece of paper, so thanks to a [https://www.youtube.com/watch?v=V7G6Na-7F0w YouTube video I found of someone else installing theirs], I was able to extract the necessary measurements.
Holes J and K for the bolts to attach the microwave to the bottom of the cabinet over it are 10 3/810⅜" from the back wall. J (left side) is 11 7/811⅞" from the centerline; K (right side) is 13 7/16" from the centerline. Both of these holes should be 3/8⅜" (technically the bolts you use are 1/4¼", so depending on how good your tolerances are, you might be able to get away with a 1/4¼" hole).
The power supply hole (M) is 5 1/85⅛" from the wall and 6 1/86⅛" from the centerline. It is 2" in diameter.
The roof vent opening (L) is 6.56½" on either side of the centerline and 4.54½" for a recessed cabinet (at least 3/4¾" recess) or 5 3/45¾" for a flush cabinet.
The wall vent opening (F) is 1/4¼" below the bottom of the cabinet and has dimensions of 4" tall and 12" wide, 6" on either side of the centerline. The centerline should go through the ▽ symbol on the bottom mounting bracket.
Hope this helps someone!