A MyBooklive is a particular type of NAS drive, I don't believe that Recuva could recover data from it.
(I don't think any recovery software available to the home user could?)
I do note that when there was a hack of them in 2021, which wiped many of them, the affected drives had to be sent back to WD to have the data recovered from them.
<a href="https://arstechnica.com/gadgets/2021/06/hackers-exploited-0-day-not-2018-bug-to-mass-wipe-my-book-live-devices/" ipsnoembed="true" rel="external nofollow">https://arstechnica.com/gadgets/2021/06/hackers-exploited-0-day-not-2018-bug-to-mass-wipe-my-book-live-devices/</a>
PS. I'm not suggesting that you may have been hacked, I'm just pointing out that the drives had to be sent back to WD for recovery of the data.
If available recovery software could have done the job then they would probably have done it that way rather having them all sent back.