My experience with APU design (I understand, can be different use case) is it is brute force, I.e. the entire design is not optimized other than to support power or cooling needs. Installation is a fallout. I understand as pointed out it is way back in the thick boundary layer, but given that there is nothing else detailed in the manual other than weight, seems it has to do with AoA. I am also speculating...
Last edited by First IFE; 25th Mar 2020 at 02:19.