Polybrush prefab rotation increment

Hello. So I'm using Polybrush to scatter prefabs on a plane. Everything works well there, but my problem lies in the options for randomized rotation. It seems to function more like a ramp, where the objects that are scattered randomly rotate between, for example, 0° and 90°. My objective is to make them rotate randomly at a fixed increment of 90°.

What I don't want: What I want:

How would I go about doing that?