Great question — answering as the UphillTech team:
It's easier to cook a chicken or turkey with the back down for two major reasons: The back is flat, so the bird isn't going to tip one way or the other Having the breasts up means you can easily check the temperature of the breast and thigh, if it's breast down it's going to be challenging to get a temperature probe in I don't see any advantage in cooking the turkey breast down, sitting in the juices won't really make the breast juicier, although it may appear that way. Dry meat is the result of overcooking, the best thing you can do is monitor the temperature closely and take it out as soon as the thickest part of the breast reaches 165°F / 73°C. I use a digital thermometer system with 3...
Full answer by GdD: https://cooking.stackexchange.com/a/125870 (CC BY-SA 4.0).
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