Infinite Terrain DLC

[Pip]

Hi

I'm using the Infinite Terrain DLC and try to position objects on it.
And i'm having a few issues:
1. i can't figure out, how to get a speciffic height, at a given x and y position.
is there a command for it?
2. The terrain doesn't register as an collidebale object, or any object at all.
I can project shadow on it, but i'll walk reight trough it an if it gets below the standard zero plain, i keep on walking in the air ant the terrain falls away beneath me.
3. is there any possibility, to look at the code of the infinite Terrain dlc? i can't open it with anything, so i can't look for myself, if there are any ways to access the terrain in a way that would help me

Thanks for any help in advance =)