How to install FreeBSD 14-2 on a dedicated server with ZFS mirror?

Hi,
I have a dedicated server (Kimsufi KS-LE-2), with 2 disks.

I would like to setup this server as follow :

1/ Disk structure
A zpool (ZFS) with a mirror using both disks (sda, sdb). This would result in a config looking like this :
config: zpool ONLINE mirror ONLINE sda ONLINE sdb ONLINE

2/ Operating System
I would like to install FreeBSD 14.2 on this server.Questions I have:
  1. How can I mount the FreeBSD Installer image (ISO-IMAGE), and boot on it?
  2. https://download.freebsd.org/releases/ISO-IMAGES/14.2/FreeBSD-14.2-RELEASE-amd64-mini-memstick.img
  3. If this is possible, the reste will be easy to achieve (shell console to setup my zpool, then follow installer for FreeBSD base installation)
  4. I have read several community topics proposing a solution based on “Bring Your Own Image - byoi”, using a RAW or QCOW2.
    1. I have tried this, but wan never able to boot past the FreeBSD bootloader.
    2. Looking at the disk structure (from Debian rescue), it show that the RAW image was burned on 1 of the two disks. Imagining I could boot this OS (which I have not been able to), I do not see how I can the change the disk structure to a ZFS Pool with a MIRROR
NB : I do not have past experience with RAW and QCOW2 images. I understand that they are pre-installed images.
Possibly, I am missing some knowledge on how to prepare them before sending them through “Bring Your Own Image - byoi” process. Help would be very much appreciated.