CM13, Android 6.0.1, SDK23.
root Supersu v2.82.
DVDAndroid Material Xposed Installer 3.1.4 (installed as system app).
configured for Classic install, direct to /system.
was previously installed Official Xposed Framework v88.2.
and now updated to Framework v89
lots of modules running (some as system apps and some as user internal memory)
ALL working fine. All modules ok.
Thanks DVDAndroid and Rovo!