It looks like the speakers are rear ported? And from a picture I saw I didn't see anything on the back that looked like it would be for mounting.
You might want to get the measurements of the shelf you're looking at, and put the Totems on a table next to the wall and space them from the wall similar to how much space you would have on the shelf, and give them a listen.
I'm not sure how much the proximity to the wall will affect their sound. You might want to test it first before buying anything. I have some rear ported bookshelves wall mounted, they're just surrounds, but they seem fine to me. YMMV...