DIY boundary mic

["mipartitus" mipartitus]

Hi, I am trying to build a DIY SASS-like system. I use Primo EM-712 capsule=
s and was wondering whether or not the left and right mics should be asymme=
tric with respect to height. I see some designs where one mic is higher tha=
n the other one, but other designs seem to be symmetric.

Is there an acoustic reason as to why the heights are sometimes different, =
or is it just that the Sennheiser mics won't fit otherwise (a problem I won=
't have with the EM-172's)?

Thanks, Gabriel