Hey Thomas,
you don’t forcibly need a breakout board adapter, but it is what you want if you don’t want to solder a connector. It has screw terminals and is available everywhere. You need a 25-pin D-SUB type.
Then you use “tool enable” pin 15 of 25-pin I/O port and GND to switch a relay on and off to which your router is connected. It is controlled by the g-code command M3 (start spindle) and M5 (stop spindle) when it is encountered inside your g-code program but is a command which you can also enter into the command entry field of your manual data interface (MDI). Most people here live in North America so they use this IoT relay (FAQ) that works with their girly power. If you are in France, you will have to find one for EU-standard 230 V instead.
The official thread for this is this one