Merlin can be uploaded as a normal firmware. No flashing or external apps required. If you have a compatible asus I highly recommend Merlin.
If you’re interested in doing as-blocking on the router itself there’s a tool called diversion which does take a bit of work to get installed, but is a bit simpler than trying to get oí-hole running on it: https://www.snbforums.com/threads/diversion-the-router-ad-bl....
If you’re interested in doing as-blocking on the router itself there’s a tool called diversion which does take a bit of work to get installed, but is a bit simpler than trying to get oí-hole running on it: https://www.snbforums.com/threads/diversion-the-router-ad-bl....