Ready to upgrade MCM 8TB - Need recommendations

I currently have two 4TB drives in MCM set up as JBOD. I back them up nightly to a 4TB MyCloud with a 4TB MyBook attached. The MCM has two ‘black’ 4TB drives, the MC has one ‘red’ and the book has a ‘green’. I’m much more comfortable with JBOD vs RAID because if I have a box failure Then I don’t need a a specific box to recover my data.

I only have about 500GB unused on each drive. Upgrade time!

I’m leaning towards a new enclosure that I can shove all of the WD drives into along with a new drive to increase my capacity. Any enclosure recommendations or other suggestions?