I have something like:
MBR:
1. Primary partition for Grub2 (ext2 filesystem)
2. Primary partition for Windows (C:\)
3. Primary partition for OpenBSD (softraid)
4. Link to next MBR (they form linkedList-like structure)
Second MBR:
1. NTFS
2. FAT32
I have installed GRUB2 from Debian 8 amd64 Live. See standard iso
here. I don't remember what I typed to install Grub2, but there are plenty of tutorials around the net.