Well, that almost went off without a hitch. So I went to enable our new virtual hosts with this set of commands:
sudo a2ensite maf.conf
sudo a2ensite qgis.conf
sudo service apache2 restart
And got returned this beautiful error:
Job for apache2.service failed because the control process exited with error code. See “systemctl status apache2.service” and “journalctl -xe” for details.