Hi,

Thanks for contacting us. Sorry we don't have such a plugin - so maybe hire developer from your city / country and ask him to customize that plugin: https://www.phoca.cz/phoca-site-plugin

-Regards.

Hola, According to facebook offcial guide, that code should be here

It means that you can paste that inside Helix Ultimate > Template Options > Custom Code (tab) > Before < / head> area || Helix3 also had that same settings.

OR

by using mentioned by Mehtaz plugin (it has field for that already), and yes, PhocaSite is free & trusted extension