Try loading the SKP as a new component definition [rather than importing it] - referenced as thus: that_definition = Sketchup.active_model.definitions.load(path_to_the_skp)
Look at the API docs for more details…
Now decide on its location: some_transformation = Geom::Transformation.new(some_chosen_point3d)
Them use: instance = Sketchup.active_model.active_entities.add_instance(that_definition, some_transformation)