?Simple? question - trainer adapter for a 2016 Cervelo C3

Simple if you understand - I hope! So it has 12mm through axles, and it needs to go in a tacx vortex. What on earth do I need? Seems that there are many variations on 12mm axles with different thread pitches / lengths, and basically I’m confused… bring back skewers!
Thanks…

According to the Robert Axle Project site, this is the correct axle that they offer:

You should also be able use one from any other brand that has the same 12mm axle x 1.75mm thread. Here are a couple of other options:
https://www.cycleops.com/product/142-12-trainer-thru-axle-adapter

Great, thanks!