You can't aim the cannon itself; you can adjust trajectory using the second-stage rocket. It's essentially just a launcher for one set of orbits, though. The actual launcher cost is probably not that significant ($100mm?) once you've built one; you can build 10 in different locations/orbits.

For the thing I want to do, one launch position works (I think) for LEO comsat constellation (hundreds/thousands of <2y lifespan satellites).