I would like to set the coordinates of the fences precisely. (I am obsessive when it comes to things being neat and orderly.) I could not find an GUI interface to do so. Thanks!
This is what we know so far:-
In Computer\HKEY_CURRENT_USER\Software\Stardock\Fences\Groups, you will find something like

Where the coordinates of your fences are in the REG_SZ values. The format appears to be as follows:-
a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t|u|v|w|x|y
a: fence ID no.
b: x-coordinate offset of top-left corner of fence from top-left corner of the desktop
c: y-coordinate offset of top-left corner of fence from top-left corner of the desktop (not taking into account fence's label)
d: horizontal length of fence in pixels
e: vertical length of fence in pixels (this appears to take into account the vertical length of the fence's label)
f: unknown
g: name of fence's label
h: monitor ID no.
i: unknown
j: unknown
k: monitor's horizontal resolution in pixels
l: monitor's vertical resolution in pixels
m: desktop page number that the fence appears on ('0' is the first, leftmost page)
n: unknown
o: unknown
p: seems to be the same value as m
q: unknown
r: unknown
s: unknown
t: unknown
u: unknown
v: unknown
w: unknown
x: unknown
y: unknown