I’ve got all of my Criterion discs on their own shelf organized by spine number.
How many Criterion titles do you have? I have 7 (well, 9 because one’s a trilogy set), which I didn’t feel was enough to justify segregating them from the rest of my movies.
I’ve got 22. I only decided to put them on their own shelf about a month ago when the six I ordered from that Barnes & Noble sale arrived.