This is the way. There are lots of great resources to get you started. It can be fun to learn something new. I would check out trash guides docker compose setup.
Oh, hmm. Radarr uses themoviedb to show you a calendar of when a movie will be released digitally. If you go to a movie in themoviedb there's a dropdown menu above the movie poster that says 'Overview', select 'Release Dates' there and you'll be able to see when it comes out digitally (meaning streaming services). Before that date it's a guarantee you won't find anything but cams.
I wonder if there's something that can be done in Seren to filter out those cams... Perhaps a blacklist with some words like 'cam'?
It's community based so not as quick to update as an automated resource but gives the file name and a rating of the quality. They also post streaming dates so if something isn't available you can get an idea of when it will be.