Backseat Mirror Frustrations!!!

Fellow mommy's and daddy's- have any of you found/had luck with a backseat mirror (for car-seat visibility) that will somehow work on a backseat that has no headrests? His car-seat will be in the middle spot, but none of our backseats have headrests. I've done so much research but can only find ones that suction to the back window or side windows. I really don't want to use a suction one. They have such bad reviews for being wriggly and falling down and not having great/clear visibility. I'm getting so frustrated. I'm still debating trying to jimmy-rig one with straps to the latches somehow, but just unsure at this point. Any help or advice is super appreciated for this new momma! Thanks guys 😊