Sorry to hear that you're having problems with Anthology X crashing Sonar X3. It sounds like Sonar scans the plug-ins fine, but the plug-ins crash only when adjusting parameters? RAM shouldn't be an issue, 16gb should be more than enough.
What version of Anthology X are you demoing? The most recent release is 1.0.4, which can be found here: https://www.eventideaudio.com/products/plugins/multi-effect/anthology-x
You are correct that we don't explicity test Sonar X3. However, I've tried running Anthology in Sonar Platinum, and have not encountered any issues as of yet.