Grass Tool - Min/Max Ground Slope Angle in BP?

Hey Guys,
I´m working on a landscape material based on slope and I want add grass with the grass tool.
My problem is, I don´t know how to make a min/max ground slope angle like for foliage, I made one but it only handles the max angle:

And here to understand what I mean:

I hope anyone can help me^^

I tried it today again, and I have fixed it^^

46eff43eb8a4b5282de25292e23618da8a27e431.jpeg
The Slope and Flat 1 can be changed, 2 should be 1