The Raven Motors are fairly free from vibration. I have seen motors on $10K plus turntables that really do vibrate. There is a dedicated isolation platform for the Raven 3. It has cutouts for the motors. I forget who makes it. Looks great & I have a picture somewhere. For a Raven one since you have more space you might be able to just isolate the turntable but will need to elevate to motor to compensate for the height of the isolation stand, but IMO & correct me if I am wrong any vibration from the motor (if it really vibrates???) would be transmitted by the belt somewhat. But honestly, my homemade stand and setup works wonders. I will qualify it as such, it is close to the equivalent of adding room treatments if you have gone there.
On a different note, the Vibraplane might not be able to sustain the weight if you have multiple arms. I know my cousin's vibraplane got a "flat". But I might be wrong. Check carefully into it. Also, I wouldn't want an isolation platform "vibrating" (since this is how is isolates) separately from the motor. This would introduce speed instability. Hence based on some suggestions here you would need to isolation platforms, one for the motor & one for the turntable. They need to be tuned to the same resonant frequency since different weights will be placed on them. Or you can just simplify and get one large single isolation platform. Complicated it gets if we let.
