Selecting capacitor for voltage-divider of half-bridge high power SMPS

How to dimension the capacitor for the voltage-divider of a half-bridge high power (>5KW) SMPS power supply?

The question is more on type of capacitor and current rating than the capacitance.

I have read some projects using electrolytic capacitors, even some computer power supply uses this approach and the capacitors are the DC Link ones too!

But as I know this is not a good choice, its better to use polymer, right?

But if you are lucky enough to find the manufacturer specifications, it's difficult to get any info about the current the capacitor will support. Some papers says that's this is based mostly on dissipation of the capacitor, I have even made an spreadsheet to calculate that dissipation, I will post if necessary, but I didn't know if this is the way to go.

^{simulate this circuit – Schematic created using CircuitLab}