There are no stupid questions!
If you look in Appendix A of your Smyth manual, and in the 2.15 firmware release notes, you will find, respectively, the industry standard room definitions ("configurations", meaning speaker labels and layouts) for Dolby Atmos, DTS;X, PCM, and (in the 2.15 notes) Auro3D.
For example, there are 58 defined configurations for Dolby Atmos in 16 channel mode, and an additional 91 defined configurations in 24 channel mode, for a total of 149 possible configurations for listening rooms. Each of those configurations has particular sets of virtual speaker labels, and those speakers in turn have industry-defined positions (see Appendix B for azimuth and elevation angles, and whether a given virtual speaker label is supported in Atmos, DTS:X, PCM, or PCM Custom). Likewise there are 50 DTS configurations, 51 DTS:X configurations, 34 PCM configurations, and 28 Auro-3D configurations.
So what the Omega 96 Pro will include will be a tower or bookshelf PRIR measurement for every one of those speakers listed in Appendix B at the standard listed positions, which allows for you to setup a listening room matching anything appearing in Appendix A. Yes you can only "map" a certain number of listening rooms by type (Atmos, DTS:X, PCM, Auro3D) in your A16, but this means you can map to any industry-standard room layout, with the PRIR measurement having used a speaker at the correct azimuth and elevation angles.
Up to 32 different Atmos, DTS:X, PCM, or Auro-3D rooms can be configured from PRIRs and stored, prior to loading into an A16 preset. But each of the rooms can have up to 149 Dolby Atmos listening "modes" (industry-defined Atmos room configurations), 50 DTS listening modes, and 28 Auro-3D listening modes.
Does all that make sense?