Wall mount AC system install!!!

[OneMustFall]

Hello,my central air has a leak been like this for few years,old system and more than i want to spend to get it fixed and keep getting it charged up,heat works great.
So i bought a window or wall mount ac,will cool up to 1200-1600sqft plenty big enough to cool my little 16x69ft mobile home.Question, im going to install it in wall,is there not a good place to put it,like next to a window or door, or in middle of mobile home.Mobile home sits on ground just those plastic deals under cinder blocks,no foundation,so it does move,settles.Anyway just wondering about location,Oh and wall are 2x6 also,thanks for any help.