Yeah, grub2 will be installed in EFI partition. You can delete the MBR once you install grub. Grub1 became obsolete long ago before kali rolling was released.
Don't login to your kali. Disable Legacy BIOS and Secure BOOT and boot kali live from bootable USB and then run those commands.
Follow my this post to install grub: https://forums.kali.org/showthread.p...l-dummy-failed