Not necessarily; by orienting the Type 1 Fixes at 90 degrees, panels can be slid in sideways. Adjacent panels can also be mounted similarly, but of course the first panel(s) installed will effectively be locked in place, unless the subsequent panels are removed. This can be advantageous for providing security for a run of panels, requiring only the last panel installed to be secure.
Also, Type 2 Fixes allow a direct push/pull fit without the need for any gap.