Power Electronics - Voltage Sensor Layout
Not so sure, your difference amplifier would work as you intend.



simulate this circuit &ndash; Schematic created using CircuitLab
IMO the above circuit is &quot;closer&quot; to an differential voltage probe amplifier. C3 forms a filter for common mode pulse. I have seen use of this circuit for monitoring DC bus voltage of solid state tesla coil.
Simulator without capacitors, it prooves the symetry of voltage sensing
As for your question, I would place the 600k resistors externally on the DC bus for safety reasons.