good night friends,
How can I have different clients working with Odoo in cloud. 

1-I need to have an environment for each client.
1 or 2 odoo servers and postgres for each client.
* If I have 20 clients, it would be 20 small server odoo (minimum resources)

2-I need to have 1 different database for each client, with only one infrastructure. (1 or 2 powerful server with odoo and postgres)
* If I have 20 clients, there would be 20 odoo databases on 1 large server.

what would be the best way to manage customers at the infrastructure, administration and other levels.

thanks,