Teslas are NOT father-friendly vehicles apparently

So I've got a Model 3 and getting a carseat installed in the backseat is a NIGHTMARE. The seat belt routing is weird, the car is narrow, and the angle is off. I've tried three different seats. Just installed a Britax Marathon and I still feel like it's not quite right. Anyone else dealing with this? Considering just trading it in at this point because I can't have a car that makes me anxious about whether my kid is secured properly. Would not recommend a Tesla to new dads.