I can't quite make sense of it.
No matter what direction you point it, you are looking at heliosphere and heliopause and bow shock and interstellar medium and all the space in between the boundaries. Like trying to study the Van Allen belts with observations from the surface of the earth.
I'm not arguing against the sense of the project and I am certain it's perfectly reasonable when you have the proper background.
The in situ approach makes more sense to me. Though it will take a lot more probes and a lot more time for them to get to the spots we want to check.