How to destroy data on a RAID with WinServer without KVM or LiveCD?

Question

Windows

There is a dedik which should be given to the hoster. On the server softovy RAID and WinServer.
What software can reliably delete data from disks if it is not possible to use LiveCD or KVM.
The ideal option would be when the program is written to the MBR and upon reboot it will start instead of the system and automatically overwrite the disk. The free space is already overwritten by 7 passages.
I found several programs, but if this is a server win, they immediately require the PRO version.
Not suitable:
BitLocker does not work with RAID
VeraCrypt asks for a password test in the bootloader
Eraser does not have its own bootloader

Answer 1

There is no exact answer, I can give a direction:
There was such an experiment on installing Debian from a directory on NTFS with adding grub4dos to the boot list for the Windows boot, it is described here .