My wife cooks her Thanksgiving turkey upside down and it is the most moist and flavorful turkey she's ever made. She slathers the outside with mayo and or butter and adds aeromatics to the cavity like fresh sage, thyme, garlic, and other stuff I can't remember. She won't let me inject liquids into the turkey since this is HER turkey.
This year she'll be using her new ThermoPop to check the IT and I'm going to use my Maverick Laser Surface Thermometer to measure the actual oven temp.