Question about EcoFlow Micro Inverter 600W (CH)

Hello Community! I want to connect an EcoFlow River 2 Pro to the EcoFlow PowerStream. I plug the EcoFlow solar panel into the PowerStream. The power will be fed into the flat's grid from the PowerStream. After studying various sources for a while, I came to the conclusion that I have to buy the https://www.digitec.ch/de/s1/product/ecoflow-connection-cable-power-station-zubehoer-35693916 so that I can connect the PowerStream to the River 2 Pro. Now the question: Do I then plug the car plug into the 12V socket on the River 2 Pro, which is designated as a car charger outlet, i.e. output socket, according to the instructions? Thank you for any relevant information!