I am running IDM 4.5.5 on SLES11 and eDirectory Would it be recommended to upgrade to edirectory 9 at this point?

I have all my other SLES servers upgraded to 12.2 and would like to standardize on that if possible. Has anyone upgraded an IDM server from 11.3 or 4 to 12.2 and then upgraded edirectory to 9? I appears to be supported: https://www.netiq.com/documentation/...a/b2jaff6.html

Is there a preferred order of upgrading to edirectory 9 if I am using the bidirectional edirectory driver? Does it matter if I do IDM or the Auth edirectory first?