I am installing four minisplit condensing units on the flat roof of a residence. The installation instructions for the Carrier 12000 BTU cool only units specifies a two meter minimum clearance in front of the fan outlet. In order to achieve this in the space available, one would have to build a rack with two units above the other two. However, with two units blowing at a six foot wall 1.5 meters meters away and the other two blowing in the opposite direction, the units could be connected easily. Would this half meter restriction cause a problem?