They should be able to find it as long as you have a <link> or <a> tag with the correct attributes/values on them.
See this section and the one below it: https://developer.mozilla.org/en-US/docs/Archive/RSS/Getting...
You need to advertise it in the head section of your html. Then any reader will find it.
Usually they are able to find it, I never had the problem that it couldn't be found if there was a feed URL in the source code. (Using the selfhosted version of Miniflux). It's too bad that browsers removed the RSS icon in the URL bar.
I've never advertised any of my rss feeds, I just leave them up at <domain>/rss.xml. I was under the impression that RSS feed locations were mostly standardized, but I'm noticing that the feed location for this blog is at a different URL.