You can put it on both or just one or the other. I get they have great techs. My guitars always come back to zero though. Maintenance is essential to keeping your guitar, regardless of style, in tune and functioning perfectly. Setup is not terribly difficult once you get familiar with how and what to do. Balance of spring and string tension is the foundation of keeping a floater in tune.
Now from time to time you'll have to adjust some spring tension to stay in tune because with changes in temperature and humidity, the neck moves slightly, changing the tension of the strings. That's the benefit to these modern guitars with roasted maple necks, graphite reenforced trusrods and stainless frets. Maintenance is cut in half because of that.