I have test from box to box with CIFS and NFS protocol. Both works fine with automount.xml solution.
I do not see an issue with my tests and I hope Openpli will adapt eudev. In future probably autofs is even easier and more powersave but for start automount.xml seems to to work well.
//192.168.1.21/usb = cifs/samba
192.168.1.21:/media/hdd = NFS
(I found a small bug with mount process as when I setup a second mount it will stop all mounts and start only the new mount. When I restart the box all mounts are mount.)
In my setup I have blacklist mmcblk0 (as otherwise it mounts all ext* FAT partities of my internal eMMC)
For test just add a line in mount.blacklist
echo /dev/mmcblk0 >> /etc/udev/mount.blacklist
root@hd60:~# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mmcblk0p23 5455808 2067192 3091760 40% /
devtmpfs 958012 4 958008 0% /dev
tmpfs 958288 284 958004 0% /run
tmpfs 958288 68 958220 0% /var/volatile
/dev/mmcblk1p1 15457280 32 15457248 0% /run/media/mmcblk1p1
/dev/sda1 240232960 60564 227946144 0% /run/media/sda1
//192.168.1.21/usb 976559616 164042752 812516864 17% /run/media/net/usb@HD530C
192.168.1.21:/media/hdd
976559616 162994176 812516864 17% /run/media/net/HD530C
Otherwise you see all partitions which can been mount:
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mmcblk0p23 5455808 2067192 3091760 40% /
devtmpfs 958012 4 958008 0% /dev
tmpfs 958288 284 958004 0% /run
tmpfs 958288 68 958220 0% /var/volatile
/dev/mmcblk0p13 1015704 902348 96972 90% /run/media/mmcblk0p13
/dev/mmcblk0p18 3952 40 3752 1% /run/media/mmcblk0p18
/dev/mmcblk0p16 253920 148 248532 0% /run/media/mmcblk0p16
/dev/mmcblk0p14 147072 56572 87428 39% /run/media/mmcblk0p14
/dev/mmcblk1p1 15457280 32 15457248 0% /run/media/mmcblk1p1
/dev/mmcblk0p4 2028 18 2010 1% /run/media/mmcblk0p4
/dev/sda1 240232960 60564 227946144 0% /run/media/sda1
//192.168.1.21/usb 976559616 164042752 812516864 17% /run/media/net/usb@HD530C
192.168.1.21:/media/hdd
976559616 162994176 812516864 17% /run/media/net/HD530C