I don't have a picture which I realize would make this easier to understand but I store my nailers in a little wall mount cabinet I built of scrap plywood. It is maybe two feet wide and maybe 18 inches tall. There is a drawer for the fasteners and above that, there are separators that are pocket screwed to the 3/4 plywood shelf under the nailers and the 3/4 plywood back. 1/2 would have worked. The space for each nailer is a little different as are the separators to fit my nailers (15 gauge, 16 gauge, two narrow crown staplers, upholstery stapler, 18 gauge and 23 guage plus a flooring stapler). The big flooring nailer hangs on the side. The framing nailer is my wife's and she like to store it away from my nailers. I don't like the nailers to be in a box. I want them out and readily accessable. A little Senco compressor is on the bottom shelf of the work table so I can be ready to go in less than a minute.
While I like my pneumatics, the nailer I reach for first in a lot of circumstances is my Ryobi 18 guage cordless nailers. Heavy but VERY handy. No hose or extension cord. It hangs on the wall to the left of the RAS.