Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: how are they wall mounted?
Document: good styling, clear hard acrylic,have it for 2 months works greatnot designed for wall  but i mounted it on the wall
Finally all my kitchen CDs are organized against a wall instead of taking up too much space on  my kitchen counter..
I like the fact that it is wall mountable and holds 20, but It is still small and I have lots of cd's
These are just what I wanted and at a good price. They are not any bigger than they need to be. The clear acrylic is a good look--light gets through. The discs are horizontal so you can easily read the spines. And they stack securely. One improvement might be holes for screw-mounting to a wall, but since I bought four, a light shelf was just as good. Tim Jamison, Denver
This CD Holder is perfect for keeping 30 CD's in a clear unit. Package says you can stack them but I probably wouldn't do that unless it was stored against a solid wall or something. It does have nice sticky feet so it won't move easily, but the height of two together might be too much. There is a small "catch" at the back so they won't slide on through and the two top slots would hold a 2 disc CD just fine.
Between the music collection and the data CDs I have almost 400 and this is the most flexible way to store them. Note that the system can be stacked and can be mounted on another surface. Note also that they have dividers so the only way to insert CDs in one fat or two skinny jewel boxes to a slot.
this cd holder has ample room for cases to fit into its slots...and it has four &#34;sticky&#34; feet which make it very stableand stackable...each holder also has two double slots for the larger cases...
love it
Your mileage may vary on this front. If you live in a place where you don't expect the shelves to get bumped, you could potentially stack them quite high.The only bugbear in this whole deal is the packaging. While Amazon takes great care in boxing them for shipping, the actual packaging for the shelves is little more than a sheet of plastic wrapped around the unit. It offers absolutely no protection from damage, so there's always the chance one of these things will come out of the factory pre-cracked.
You'd think you could get stackable CD holders for less, considering what they are. But I couldn't find any. So I guess these are doing the trick, and at the best price I could find; but frankly, I still feel a little robbed. I suggest shopping around more than I did.
Answer: I don't see a way to mount them on a wall other than drilling a hole in the plastic (which might result in cracking the unit) then putting screws through intothe wall. Mine are all stacked on each other.