Ahh that makes sense now! Thank you. On the TRP website it seemed like they were saying you needed an adapter for both front and rear regardless of rotor size
To clarify/ confuse things further, I have flat mount spyres and paragon machine works rocker dropouts; I found the 160mm rear mounts directly without the adaptor.
That's for a front brake. Flat mount front needs an adaptor - you have it one way up for 160 mm rotors and flip it for 140 mm.
Rear does bolt directly to the frame if you're using 140 mm rotors. You need an adaptor to use 160 mm rotors at the back.