Trouble installing NextDNS to Bazzite

I've been trying to figure this out for a long time and I gave up for a few weeks but I want it on my system. I looked around forums and saw one say that you can install through Homebrew, but when I do that I'm told
Error: open /etc/systemd/system/nextdns.service: permission denied
and I can't figure out what to do to get it working. I've attempted
sudo
on brew and with the install command but both say that no such thing exists. I just want a more secure connection.
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