If your desk is up against a wall, the best way of keeping your monitors raised off the desk IMO is by standing them on a shelf. I have some triple track shelving, and the bottom shelf is set about 5 inches above the desk. I used toggle bolts for the tracks so everything is super strong. You can put your monitors on the shelf as well. This gives you loads more desk space, and I use the area under the shelf to keep my MIDI keyboard when I'm not using it. It's perfect! I also have my interface and VRM box on the shelf. One thing I cannot stand is a cluttered desk and this completely solved the problem.
I also have a relatively low desk (about 25" high) which allows ample space underneath the shelf, and the monitors are exactly head height. No neck strain at all. I prefer a lower desk anyway.