When I began my apprenticeship back in the dark ages before overhead belt drive.... The shop I apprenticed in had four lathes, one had a four way, the other three had lantern posts. I learned on the lantern posts because the journeymen hogged the 4 way.
Eventually I built my 4 way. and kept it in the top of my tool box. I had spacers to put under it for all three lathes. 40 years ago I moved and went to a different shop, There we had a mix of 4 ways and Aloris types. But there few Aloris tool holders, we still had to set the tool height because everyone kept their tooling in their boxes. Management wouldn't buy enough holders for every use.
Now, as a hobbyist I can make all the holders I want.