John,
The Blackmagicdesign rack is likely more trouble than it’s worth seeing how large it is.
The “dock” at Amazon seems like a waste of money. The problem I see with it is that it’s leaving part of the drives unprotected from dust and contact, and at that point one could just buy a cheap external case for an SSD, buy the SSD separately, and just not cover the drive with the lid once it’s attached:
more portable, cheaper, and with the “same problems”.