Moving external disks to a DAS?

[Host-in-the-Shell]

When I first started experimenting with hosting JF, I had some spare external drives and decided to attach those to store my media; fast forward a couple years later, and now I'm considering using a DAS to make my setup more convenient and take less physical space. Having never used a DAS before, I have a couple questions regarding it, in case anybody here has experience with one:

• If I shuck the hard drives out of their encases and insert them on the DAS, would that work? 
  

• Does the server read the disk the same way it does when plugged externally through the DAS, so I don't have to update fstab?
  
• Would I be able to share all the disks through NFS as I did before when plugged in the DAS also?
  

The external drives in question are 2x 6TB, 1x 10TB, 2x 8TB Western Digital Elements Desktop USB 3.0 external hard drive and the DAS I'm considering getting is a TERRAMASTER D4-320.

Thanks in advance for any response.