Why not just use a raspberry pi?
Follow the steps below in order to setup your Pogoplug with PiHole.
**Pogoplug v4 (Mobile) **
roughly $15 on amazon: https://www.amazon.com/dp/B01HNFMGLU/ref=cm_sw_r_cp_dp_T2_Ch.Bzb6M17HAE
SD Card 2GB+
32GB for roughly $10 on amazon: https://www.amazon.com/dp/B06XWN9Q99/ref=cm_sw_r_cp_dp_T2_aj.BzbNJDZQ9M
Pogoplug Debian img
https://github.com/pepaslabs/pogoplug-v4-bodhi-rootfs-debian
http://blog.qnology.com/2014/07/hacking-pogoplug-v4-series-4-and-mobile.html
Once ready, power off your pogoplug and remove the sd card.
Format your sd card (I used SD Formmatter)
https://www.sdcard.org/downloads/formatter_4/
use your favorite image tool to write the pogoplug debian image to it (I used win32diskimager)
http://sourceforge.net/projects/win32diskimager/files/latest/download
use your favorite image tool to extend the the image to the full sd card (I used Gparted live)
http://gparted.org/livecd.php
plug your sd card into the pogoplug and boot. you will need to connect via SSH
user: root
password: BLANK JUST PRESS ENTER
Check to make sure it you are using the full sd card and have enough space. (after install roughly 1GB will be used)
df -h
Update:
apt-get update
apt-get upgrade
Install needed software: This step will take the longest to install git
apt-get install curl
apt-get install git-core
Remove unneeded software:
apt-get remove apache*
apt-get autoremove
Adjust your timezone:
dpkg-reconfigure tzdata
Set a root password: (OPTIONAL, but recommended)
passwd
curl -sSL https://install.pi-hole.net | bash
You now can follow the guides on PI HOLE for configuration (https://github.com/pi-hole/pi-hole)