Hello, I'm a freelancer with more than 5 year of experience working with odoo, since openerp v7 to Odoo v11.
I work with odoo daily more than 8 hours every day.
I've knowledge in all odoo modules, i'm very expert in most of them.
I've not installed before in a qnap, but i've installed on other linux devices, such as raspberry, so it's the same, i only need ubuntu server installed on the device and ssh access.
do not hesitate to ask any doubt or question you have.
Kind regards.