When to apply Hold Codes - pre or post rollovers?

Hi all,

Heading into a rollover scenario for the first time in a few years. I usually apply hold codes to perfs AFTER rollovers, but COULD I apply hold code maps prior to Rollovers? If a patron's seat in a perf in the rollover has a hold code on it that is unbreakable, will the rollover throw an error or will the rollover work and seat that patron in a seat that has a hold code?

Thanks

Jessica