Make sure they are in a secure location and you can't knock them over.
Two of my drives, at home, were living on a shelf at shoulder level; well protected from mr clumsy. However I brought both of them with me when I came over. They are currently sitting on a coffee table around a nest of cables.
Last weekend I was disconnecting them when they both went flying. One fell on down from its side to the base and the other wound up upside down in said nest of cables.
These are pretty big drives, 14TB and prices are rocketing right now. Current replacement value is £500 to £700 depending on where you can get them from.
Worse is that they take up to 60 hours to scan. I'm still trying to find out the level of damage done. Most of it was fully backed up less than 2 months ago as I had a large revamp of my storage systems and a full resync. But you always have stuff you have created and never got around to backing up again.
Cost is one thing. Lost data is something entirely different.
This is a salutary warning we all need to remember from time to time.