Now with powerline adapters, the one thing i've noticed is that they need to be within the same electrical circuit. Going outside of say a room that is fused together at a junction with a room that has the powerline adapter will work best. Also, just remember that powerline adapters are just extensions. you are just extending on port of the router to another device that is a distance away from the source.
This goes back to the adapters being in the same circuit. As for DSL, i'm not sure how that works, but as long as you are using the power adapter after the router to the device, nothing should change.
I could be wrong, and if I am someone will correct it.