Fill price including the dutch Tax 6% and 21% on the product page
Installation by extension installer ocmod.

Demo with the plugin on :

Demo opencart 2.2.0.0 with module installed.
username : demo
password : demo

For support on product send a mail to servicedesk-opencart@computim.eu
Support hours 9 - 18 Netherlands time zone

Installation test on version 2.2.0.0 and 2.3.0.2