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Most of us have only traveled through the eluvians at the whims of those who called themselves our gods. We know them as mirrors that always go from one to another, a bonded pair linked no matter the distance.
Solas has outsmarted the so-called gods. If we used normal eluvians, they could track us to our lair. Solas has improved upon June's work by creating a mirror whose singing stone can change its tune to take us to any eluvian and not just its bonded partner. Thus, we can travel wherever this rebellion needs us, with no fear of pursuit.
Travel is as safe as a normal eluvian. If you have questions, ask for the Slow Arrow, and I will guide you.