Which snow load zone do you live in? Aluminum sags quite easily. If there is now 40 cm of snow on the roof, of course even more. There are cross beams that have a steel reinforcement in the core, those can span more than 5 meters.
The first supplier (and at the same time the most expensive) had a third post in the middle. At that time I created the 3D view and haven't changed it since.
In winter, when snow was on it and it got thoroughly soaked with additional sleet, you could see the deflection. However, this is only temporary. It wasn't enough for the sliding doors to get stuck. In an extreme winter, I would prudently clear the roof or put up a construction prop in the middle at the front.