Not all the time.
With modern SAM systems they are launched from a vertical launch system. That has a 360 degree arc for each missile but individually. For most modern radars the illuminators needed are either part of an ASEA arrangement OR one is on each quarter arc. CIWS tend to be split with a near 180 degree arc port and near 180 degree arc starboard. Decoys are split port and starboard.
This is not always the case, that's my point. Many ships including mine have "blind spots" in the rotation of the CIWS, deck gun (57 or 76mm), decoys are split port and starboard but you'll still always have only one windward side, and there there is always the stern as well. I was just wondering how intricate all this will be.