Well, when it comes to forcing the impact into a place less harmful? Well, if it's possible you want to crash it into Antarctica, into the ocean as far away from land as possible, or an uninhabited stretch of land that's preferably also not forested, and with as steep a trajectory as possible. The ocean is not a bad choice, but the impact is likely to cause tsunamis, having it land in an uninhabited stretch of land comes with rocky ejecta and dust, and the smoke from any ignited forest fires if it lands in a stretch of forest makes this worse. Antarctica is the best choice here because it's not floating on the ocean but still a very large, thick layer of ice that interacts well with the atmosphere and gets deposited back down fast.
You want a steep trajectory because that forces most of the force and energy deeper into the planet. The shallower the trajectory, the more of the energy gets used to create a spray of debris.
You want a steep trajectory because that forces most of the force and energy deeper into the planet. The shallower the trajectory, the more of the energy gets used to create a spray of debris.