Best way to test new HDD’s for a cheap storage server

I want to build a storage server and bought 10 x 2TB WD RED’s. The HDD’s just arrived.

Is there any tool you guys use to check for bad drives or to best defend against infant mortality before copying real data on to your disks?

Is it better to check each single HDD or to test the array (ZFS raid-z2) through copying a lot of data on it?

Thank you for your advice in advance!

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