Reflection probes spreading light through walls

What can be done about a reflection probe making places which should be shadowed appear bright?

In my scene I have a room with an odd wall shape. It's nearly rectangular, but has 45 degree angle cutting in to the room on part of one wall. This means I can't neatly place the reflection probe in the room without it's bounds going through this angled wall, and so affecting the next room over.

I haven't done the lighting in the other room yet, so it should be pitch black pretty much. But the reflection probe creates a light patch which you can clearly see the boundary with.

So what can I do about it? If I pull the reflection inside the angled wall, it misses heaps of the wall that's straight, and so the reflection on a big glass door nearby has a weird warped edge when using Box projection. am I supposed to use multiple probes in one room to piece by piece fit the shape? If that's the case, what would I do if the room was round?

 

OK so I can't just place probes at different angles to meet the wall, because seemingly you can't rotate the box for the probe?

Also, the weird warping I have doesn't seem to be anything to do with how far out the bounds are. So maybe I can have it pulled inside this wall I don't want light to bleed through, but now I have a new problem with why the reflection looks weird. I have attached a screenshot below. If you look at the bottom right of the reflection you will see it looks like the tiles are going up on a 45 degree angle. If you look on the left of the reflection, you will see a chair which has the correct orientation.

 

Thanks for the tips.