primeramente, check whether your PCB is high voltage. Generalmente hablando, high voltage is defined as starting at 1000V.
Habiendo dicho eso, there is absolutely nothing wrong in general with using surface-mount parts in a device running at these voltages, so long as the parts you are using are rated for voltages you are using them at. Keep in mind as well that you do not need to make a single decision between SMT and through-hole parts. You can mix and match both within a single design.
#PCB Design #PCB Assembly
https://www.youtu.be/lGXtIzSSJxY?si=eSliUaOKcJf6Oxv1
