Kali quickstart

Download the "bare metal" primary ISO
Push the ISO to proxmox
Create a VM with it
Update sshd to only allow one user through with a proper key auth

# MDM
AllowTcpForwarding yes
PasswordAuthentication no
KbdInteractiveAuthentication no
ChallengeResponseAuthentication no
UsePAM no
AllowUsers #just_my_user#

Enable and start the ssh service

sudo systemctl enable ssh.service
sudo systemctl start ssh.service