The backplate on lga2011/2066 is M4x0.7 threads which is the same as the mounting rods elmor uses. Vince uses 6-32 rods. Did you check if the larger m4 rods will fit in the Trex top? There might be enough clearance, I'm not at home so can't check/measure myself.
If you want you can modify the backplate to fit the 6-32 rods, and it will still work with M4 mounting for a waterblock ect. I did this to three mobos without issue. Remove the ILM/backplate. Drill the holes out with a 3.55mm drill, then chase the threads with M4x0.7 tap. Reinstall the ILM/backplate. The 6-32 rods will pass through, and standard m4 mounting posts still work. Just be careful with the m4 stuff as the threads are pretty shallow (weakened). Obviously do at your own risk, I assume no responsibility for any damage