Yes, it seems the Corsair LPX are too tall to fit the Noctua 15 mm thick 120 mm fan on the underside of the NH-L12 heatsink. So, I started looking for some very low profile (VLP) DDR4. Crucial made some VLP DDR3, but all of their VLP DDR4 is ECC.
I hadn't heard of Innodisk before. On their website I found that they make Non-ECC VLP DDR4 that is only 0.738 inches / 18.7 mm tall in 4 GB, 8 GB, and 16 GB modules at speeds up to 2666 MHz . At this height a 25 mm thick fan is ever so slightly too thick, but 20 mm and 15 mm thick fans would fit on the underside of the NH-L12.
FWIW, ceski has shown in the News forum that it can actually be used at significantly higher speeds- see https://smallformfactor.net/forum/threads/innodisk-booth-at-computex-2017.2322/page-4