I don't know the layout of your room, but, wall mounting may be too far from the front speakers, so ceiling mounts or free stands would work. I have the Klipsch Promedia 5.1 and just bought some OmniMount SAT 2 speaker stands from ebay. I just now saw them here
for the same price. They may have something that would work for you.
Aren't the Z-5300's base able to adjust so you can just screw it into the wall? See here.