Turning on the iPhone’s Stolen Device Protection is simple—it’s just one small toggle in your phone’s settings.
There is one crucial detail that the article doesn’t mention: Find My iPhone must be enabled to enable SDP. That is to say, enabling Find My (along with biometric authentication) is a prerequisite for SDP.
For Fedora, replace the current installer (Anaconda) with the openSUSE Tumbleweed installer.
One of the aspects I love about the openSUSE TW installer is the ability to remove groups of packages for the initial install. This is particularly useful if you never use certain programs or intend to replace them with the Flatpak version.