Given the orbits of Pluto and the KBOs if you wanted to search the sky for similar objects, you will have to look into the same part of the sky because Pluto and other similar objects are a part of Kuiper belt, thus they will be find together over there.
Kuiper belt is a disc like structure in the outer solar system that extends from the orbit of Neptune to the approximately 50 astronomical units from the Sun. Though it looks similar to the asteroid belt, it is far larger than that. This belt too consists of remnants from the time of the formation of the solar system.
This Kuiper belt is a home to many dwarf planets like Pluto, Orcus and Haumea.
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