I hope it's OK to butt in. I have all of my DVD's on an 8TB drive that I bought from Costco. They have been ripped uncompressed in to MKVs. There is a program on the internet that will do that that is offered for free. I use a Shield/Kodi to play them. Really saves space as all my DVDs are now...
I only have 8TB so I feel your pain. With 4K we again are outgrowing current storage solutions. (I'm still at 1080 and I'm losing space)
I too, have settled on the Shield and for now don't see me ever going back.
Yours sounds like a nice set up- thanks for sharing.