In a selected port, with a crane. That’s basically the tl;dr from the video Kalash posted at 4:23 time index.
But the Houthis didn’t fire at warships. I know some outlets had similar sounding titles but they were clickbait and their own articles were contradicting their title. The Houthis were firing towards merchant vessels and within 20 km or so, there was also a warship, which then reacted.
It’s just a setting like so many other things. You can put in individual IPs you trust or IP ranges.
It seems Plex has figured out lots of Plex ‘server admins’ are just normal Windows users and click OK on everything w/o reading any change logs or checking any settings. So it’s easier and saver to enable a lot of things right away. Admins can just go into settings and adjust it.