Place it, then, from any place you like (although you need to be in line of sight usually because it's so small) then Hold X again, like when you want to control a turret.
You will then switch to a camera view and be able to fly it. It can't fly up-down, it only drops as the level drops, but if you want to get over something like a barrier if you just go for it and drop onto the barrier you can get over it, but you have to be above it to begin with. Grenade button in camera mode blows it up, but you're sometimes better off placing it hidden, close to their spawn, so it acts like a COD UAV in a way, radar within radius of device.