I watched this demo video (link below) I found on youtube about laid back breastfeeding and it doesn't look like baby's nose will be blocked. I think if mommy is propped up a little as she lies back, it will be okay.
Reckon all mommies have different preferences when it comes to their most comfortable and most optimal breastfeeding position. Well endowed or not, try a variety of positions and see which one you like best :)
https://youtu.be/_KbnWX2439c