The Command hooks are going to work only as good as the surface it's attached to. If the wall paper is installed shoddy, not a good glue, the Command hook will adhere to the wall paper, but the wall paper will give way from the wall. You never know until you try.... case in point:
My Keystone Camper had Command hooks ALL OVER the place for 8 years and not a single one of them failed, nor the wall paper.
Now, in my stick-built house? I remodeled the bathroom. Took the room clear down to studs, new insulation, vapor barrier, dry wall, mud, primer paint and paint. Wanted to hang a simple plastic (not heavy at all) clock on the wall. Used a Command hook. It held just fine for about 6 months and then all of a sudden the clock fell. The Command hook was still attached to the paint, but the PAINT separated from the wall. I ended up just using a nail after that!
So, you just never know. Try and see what happens!