There's resonance and the Drives to think about here.!! Resonance from one motor will travel to the other sending the drives Bonkers. Each motor Drive will struggle to give stable performance because the Resonance compensation will be all over the place. Even the best Digital drives will struggle and Cheap drives with fixed Compensation will run horrible. Cheaper drives struggle with resonance from one motor so no chance with multiple motors and resonance cripples motor performance.

None starter to me.!