On the Z370 board the EX3 was a dream. Required no flashing and gave us a full thunderbolt bus. The EX3 on the Z690 was nothing but trouble and I never got anything to connect. I could be wrong but this card did not appreciate being jumpered or headerless.
I can't speak to the TR but I've read some success here and there.
The GC-Titan 2.0 is simply the best way to go. Man, I love this card. I believe I'm using NVM33 (typically for onboard).
Sketchy Pro-Tip: If your SOC Clip gives you trouble consider sanding it down a little bit so the pins have a lower access on the chip.