I followed Hetzner's docs on how to mount it with a small twist.

The docs say to edit /etc/fstab to add some automount config using charset=utf8 but the VPS OS did not include the utf8 charset module by default (Ubuntu used to to bundle it but now it doesn't). So had to run:

# Install additional packages
sudo apt install linux-modules-extra-$(uname -r)

# Make OS load nls_utf8 module on boot
sudo echo "nls_utf8" >> /etc/modules-load.d/cifs.conf

There was a way to load the module without reboot but can't remember. Once I did that, I followed Hetzner's docs and that was it.