The way my shop is set up, the back has room, the sides don't, it rolls into a space between a wood rack and tools.

I was thinking filler rods in tubes right over the top of the welders, slight incline.

And before someone says something about how do you hold the short ones... not sure if anyone has done it, but a trick from gas rods in an old muffler shop, pair of pliers and bend a J into the end of a short rod so it hangs on the edge and doesn't slide down into the holder.

Back would be for hanging things that don't get used often, extra cables, extension cord, wheels and discs for grinders, etc.

May adjust organization for now, I planned for now to have a welder on each side, bottle on each side, but I went 125, so I may put both welders on one side for now to offset the difference between a 40 and 125 till I pick up a 125 75/25... IF I pick one up before I get the other MIG