How to hover without an anchor below you.
Skilled mistborn can hover in midair given multiple firmly anchored target points. If the mistborn is hovering next to a building, pushing and pulling on metal beams, the forces look like the above. The numbers in the image are chosen so that the counterforces from pushing and pulling add to 500 N pointed upwards, which is just enough to make a 50kg allomancer hover in the air. And because the two counterforces apply to the same point on the allomancer, she doesn't need to worry about rotation.