I had previously made a 90 degree corner variant, but it was only in 1 size and a single variant that I needed at the time. This model has all 4 variants.
Currently the size 224x190 is included. I will upload the other sizes today as well.
I had published them too soon, now the final models are available.
@Jylin_36948 pointed out that the B models don't always stack on top of each other. I just uploaded the Fusion 360 file so everyone can play around with the models.
The author remixed this model.
Added the other variants: inner and outer corner, and in both orientations.