Some VPN providers even allow export, like text formatted, in such a way that if one copy-paste it into: Interface - Wireguard interface - Edit - Import conf./Load conf it will prepopulate many fields.
Just remember ‘Configuring a Kill-switch (optional)’ will not allow you to further specify any traffic outside of VPN - but may be desirable if all traffic should go through the VPN.
And as for DNS - in reForis you can specify DNS provider having maybe more control from what can VPN offer to you (as example Mullvad DNS, here is the source for it) and it won’t be all traffic information ending with one provider.
And it’s worth it installing ‘Watchcat’ as this can ping some host - may it be DNS you are using - and based on response, if missing, restart the interface/device.
Sometimes connection drop despite keep alive option and thus it’s not necessary to log in and do it manually.
Installing packages ‘luci-proto-package_X’ will install usually LuCI, translation, and the actual service. If you install service standalone, it won’t show itself in LuCI.