Does anyone know if you can fit a rear and forward facing car seat using the lap strap in the middle? My car (Zafira) doesn't have an isofix fitted so this isn't an option. And the seat belt in the middle is a lap strap. I will have 4 children and the idea is that when we all go out as a family, three children will be in the back and one in very back so I have room to put the pushchair!