Our Odoo vr12 Enteprise is installed behind firewalls so that we don’t allow any external traffic to our Odoo. The reason for this is high data security policy.
Anyway, we want to utilize some of the Odoo apps which require external access in order to get the full benefit out of them (webshop, marketing, CRM for our distributors etc).

The only safe solution we have figured out is to create another Odoo installation and build an integration between these two instances.

Has anybody created this kind of set up? What are your experiences from it?
Is there any ready Odoo- Odoo integration app available?
Or has someone figured out some other kind of solution to solve this kind of situation?