I'd agree with JDubU's recommendation... both on the shelf, and Monoprice.
There's a big advantage to putting it on a rack shelf... you can grab and go if you need to use it outside your lab. And move it around, when the mountain can't come to Mohammed.
Screwing it into a rack isn't a great option for a scope, IMO, unless it's there strictly to monitor some fixed set of signals, also permanently mounted in the rack.