Car seat experts

Omg I swear I read this manual over 5 times. One section says "when available, LATCH is the safest way to install car seat" then in another section it says "the middle seat is the recommended safest spot for this car seat."

I only have LATCH in the two sides and not in the middle seat. So which is better?

Also, we ended up installing it behind the driver with LATCH but my husband doesn't have enough space to drive with the car seat behind him. So is the middle installed with a seatbelt better than behind the passenger with LATCH?

Thank you in advance!

This is my car seat. I plan on making an appointment with a car seat expert but if anyone knows the answer to my question that'd be great..