Yes, if you put the warp jammer at a planet that is a choke point then the AI will be force to send the wave to another planet.
BUT, if no other planets are directly adjacent then the AI will send a wave going to ?? which is basically a wave going in a random direction from a random AI planet. Although I have a theory that the random AI planet is a random AI homeworld.
Of course the wave going to ?? will not be affected by any multiplier since it technically doesn't have a true target.
This kind of wave also could be a bit dangerous, since the wave could come from the opposite direction than your expecting.
Edit: After reading further into the last post...
The wave will be forced to go through the planet, but you will not know when they will get to that planet. I've seen those ?? waves to take from 2 minutes to over an hour before those ships actually pop up.