If you want to use Debian, you could try this:
Once you download the installer:
wget https://raw.githubusercontent.com/hestiacp/hestiacp/release/install/hst-install.sh
Execute this command:
sed -i '/^\s*if \[ "\$?" -eq '\''0'\'' \]; then/a \\t\t\tif [[ "$type" = "debian" ]]; then\n\t\t\t\tsed -i '\''s/sury\.org/sury\.su/g'\'' hst-install-debian.sh\n\t\t\tfi' hst-install.sh
And now try to install it again bash hst-install.sh with the options you need.