I've taken a new pic, ignore the paint it's just to distinguish blocks. Personally I use the pole on the outside like on my first pic just because it fills the corner gap as well as allowing you to place blocks in the corner. It's not the best but works for now I guess :p
I may be wrong, but I think you can change settings for everything like this in the spawning XML.
(C:\Program Files (x86)\Steam\steamapps\common\7 Days To Die\Data\Config\spawning.xml)