Do a full writing check from beginning to end beforehand.
But I don't like my 8TB WD80EFAX ones. They run quite hot @8.8W. and IMO way more noisy than the other models I have of WD Red plus drives.
If the full check comes back clean, I would only use them for offline and external copies of data as they probably have a lot of running hours in real life. I hope you didn't pay too much.
If they are hot maybe yours are air, these are helium. Yea, leave it to WD to name the same what are as different drives as they could make, heck what two different companies like HGST and WD could make even if one bought the other.