I’m sharing an iray studio setup with multiple HDR environments I created with HDRlightStudio. There are seven different configurations in this one file. You can even switch between them in this single .max file by simply using the scene states option (tools/manage scene states).
Keep in mind, no single preconfigured studio setup will be optimal for every scene or object. Sometimes you get lucky, but most of the time in order to get the best look for any particular model (especially things like vehicles) you need to carefully place the reflections/highlights. That is why applications like HDRlightstudio are lifesavers.