For a better terraforming process, and to give dwarf planets more protection from asteroids, they could be moved to Uranus or Neptune's orbit. it would be better for them because they would be nearer the Sun and the Earth and they would receive more sunlight, more protection from asteroids, etc...
Likely New Moons of Neptune :
Pluto and Charon
Orcus and Vanth
Quaoar and Weywot
Eris and Dysnomia
It is possible to put the first 6 between the orbit of Proteus and Triton
The last three will be between the orbit of Triton and Nereid
The problem of turning them into moons is that they could interfere in real moon's orbit, like Nereid.
Likely New Moons of Uranus :
Extra Objects for Binary system.