Triple Boot Manjaro KDE, Manjaro Gnome and OSX

I am running a dual boot with Manjaro Gnome currently on a MB Pro Retina. It works fine. I want to setup a triple boot with Manjaro KDE, Manjaro Gnome (already there) and OSX (already installed). The last time I tried to setup an “install alongside” in the installation manager but it destroyed my bootloader for Gnome so only the new KDE install worked and Mac OSX worked. How do install KDE without destroying the bootloader for Gnome?