I too am wrestling through this Scenery placement "thing"
I found the Rasmussen videos very useful and adopted his ideas-a,b,c, to z,zz,zzz etc for placing Scenery Files
It works! but if adopted for Orbx -FTX Central cannot see the Orbx entries.
I compromised and removed all prefixes from all Orbx files and let them fall where they may
Orbx appears to have a alphabetical system operating within its own scenery Files and they all went into the proper order
So far so good-initial flights OK
Ini file attatched
Best of both worlds?
xxd09
scenery_packs.ini