Actually, yes.
Kinda threw me for a loop on CA because I was expecting javascript to sort the array as so that UD+ would come after UD. But, the reverse is actually true (had to have CA do a reverse sort)
And then looked at my system log to see which order things are actually installed in from a boot and it's not what you expect, and your change won't work.
Jan 11 07:50:21 ServerA root: -----------------------------------------------------------
Jan 11 07:50:21 ServerA root: unassigned.devices-plus has been installed.
Jan 11 07:50:21 ServerA root: This plugin requires Dynamix webGui to operate
Jan 11 07:50:21 ServerA root: Copyright 2015, gfjardim
Jan 11 07:50:21 ServerA root: Copyright 2016-2019, dlandon
Jan 11 07:50:21 ServerA root: Version: 2019.12.29
Jan 11 07:50:21 ServerA root: -----------------------------------------------------------
Jan 11 07:50:21 ServerA root:
Jan 11 07:50:21 ServerA root: plugin: installed
Jan 11 07:50:21 ServerA root: plugin: installing: /boot/config/plugins/unassigned.devices.plg
Jan 11 07:50:21 ServerA root: plugin: running: anonymous
Jan 11 07:50:21 ServerA root: plugin: skipping: /boot/config/plugins/unassigned.devices/packages/unassigned.devices-2020.01.10a.tgz already exists
Jan 11 07:50:21 ServerA root: plugin: creating: /tmp/start_unassigned_dev
UD+ installs at boot before UD.
EDIT. nm you're looking at /boot and not /var/log/plugins to see if UD is there