Good day. I've had a long trip planned for 2.5 months with my child. T…

Good day. I've had a long trip planned for 2.5 months with my child. The journey is 700 km. I think I should buy a car seat, but the position is 35-40 degrees, not horizontal. Has anyone traveled with small children? I plan to drive at night so that the little one can sleep, but I was advised to take the child out of the car seat every 1.5 hours. I thought about putting a baby insert in the car seat, but I don't know if it will be comfortable for the child and I won't understand. What do you recommend?