You should probably have a look at the True Peak Scanner component for fb2k which can also produce several other values like LRA, DR, RMS, LUFS if you enable it in Advanced Settings.
No, True Peak should not exceed 0 dBFS on a CD. Should we have a +3 dB headroom due to poor CDs anyway? Maybe, an option in the DAC would be nice. It will affect measured SINAD negatively.