No sense to have Atti twice. Most will suggest to make bottom position RTH. I have P1s. Same bird . Just different frequency. I have bottom position set to manual. The reason for that is taking
off with full throttle is sluggish in Gps or Atti on my 3 P1s. If I take off in manual, it's much quicker and no chance for a tip over. I really don't even have to give it throttle. I flip S1 to manual, it pops up and I immediately go back to Gps. Works every time. I also have the self centering throttle stick.