You can set custom DNS to block ads and whatnot on androids and most smart TVs AFAIK. It should just be a setting somewhere. I use
base.dns.mullvad.net
For TV you might need IP address in which case it's 194.242.2.4.
Source and more info about this here: https://mullvad.net/en/help/dns-over-https-and-dns-over-tls