Virtualization on Rock Pi X - Docker/VirtualBox

Hi, looking on this board as a small x86 device for running my k8s/virtualbox. Does anyone here have any experience with this? The goal is to run iRedMail, NextCloud and some nginx proxy for SSL in front of them in as small as possible package with lowest power consumption. And maybe Pi Hole if it would fit to 4 gigs of RAM.
Thanks for any tips!