doubledamnit
+1y
the one on the right looks better to me.
ive never made a latch for a nitrogen bottle, but the first thought that comes to mind is running two tubes from bracket to bracket on the bottom, then once you put your tank in, you can run a tiedown on each side of the bottle around it and the tubes, im sure there is a more refined way of doing this but its the first thing that came to mind.