Have a Synology Diskstation at home which I among other things use as an OpenVPN server. When I’m traveling I enjoy being able to watch Danish TV without any geographical restrictions. I do this by having my OpenVPN profile (ovpn file) tunnel all traffic through the VPN incl. DNS. It also means that I can use it to safely browse if on a questionable wifi such as no-encryption hotel wifi or conference wifi. The two commands you need to add to the configuration generated by the OpenVPN server on the Synology ( being by DNS in the house) is as follows:

dhcp-option DNS"
redirect-gateway def1