using cooking propane torch held sideways
Practically speaking, you can tilt the torch down about 60degrees.  Beyond that, it will tend to either cut off or flare.  However, tilting it down that far is good enough for most purposes.  Wanting a better angle is one of the reasons why more expensive "kitchen torches" exist.

So, if tilting some isn't good enough for you, you can buy a kitchen torch, a gun-shaped propane torch (which isn't less expensive, but is more powerful), a gun-shaped butane torch, or even a propane torch with a hose attachment.