i have a mullvad sub and can i install in workstation (whonix)?
is it safe to use?
does it help anomity or does not help?
Unnecessary and possibly dangerous, it does not increase anonymity. You can try sys-net > sys-firewall > sys-vpn > sys-whonix – if you want to use a VPN.
As per:
Mullvad on Qubes OS 4 (Mullvad help)
Understand the difference between a VPN and Tor:
Whonix ™ versus VPNs (Whonix wiki)
If sys-vpn is running Fedora as a template I highly encourage disabling systemd-resolved in those templates. This is default for the Debian templates and fires up less networking resources also.
systemctl disable systemd-resolved
systemctl enable NetworkManager