It's just that I'm not fully familiar with the amplifiers you are using and I am relying on your stated objective with respect to the enable/inhibit signal. Your wiring will work as intended, if it turns out you need to pull to ground then nothing will have been harmed.
I do strongly recommend that you disconnect the motors from the ballscrews when first powering up to confirm all is working as expected. A runaway motor could definitely cause damage if it catches you by surprise.
RT