TVS diode protection on a capacitor bank?
Best to install 40 mm MOV's at the motor windings, rated for 150% of the applied voltage, AC or DC. They will act as snubbers during any back-emf, and are high-impedance during operation when current is ON. During this 'switching' action they will limit voltage spikes due to overshoot and undershoot.

More or less they are protection for your VFD. The capacitors on your main power rail are your protection for that area. Better to use many small ones than one huge capacitor, so ESR is not an issue and they will keep the power rail quiet, free of noise spikes over 1 volt.

For an ultra-quiet power rail you would need to add an inductor of 1 mH, rated at twice the rail current, with capacitors on both sides of the inductor. Noise could be reduced to 100 mV this way.