Darktrain, I strongly recommend a slightly spaced arrangement with cardioids unless perfect mono compatibility is a requirement for some reason (which would be rare nowadays).
The ORTF method is one such approach that works well in a very wide range of applications. This involves spacing the capsules 17 cm apart and facing them outward at a total included angle of 110 degrees. The stereophonic recording angle of a setup like that is ca. +/- 49 degrees.
Schoeps makes a relatively inexpensive accessory called the "STC" which holds two capsules on Colette cables at this distance and angle, but you can also rig up this type of arrangement by other means.
--best regards