Center seat car seat mirrors?? Help!

We put the car seat in the middle for our baby due any day now because I’ve ready many places that if you’re able to, the center seat is the safest. Well the car seat is secure but the mirror we have can’t hang because our center seat doesn’t have a head rest. Any recommendations for a mirror that is compatible with a car who’s center seat doesn’t have a head rest to strap it to?? I don’t want to move the car seat by the airbags over a mirror if I don’t have to.