I have a plan having my main odoo for my main company, then we have to install another instance for multiple subdomains for our clients,

In other words, I have 1 windows server 2012, 1 domain,1 subdomain is 1 client, 1 subdomain is to 1 odoo instance with own database in postgresql. (e.g.: subdomain1.domain.com, subdomain2.domain.com and so on depending on how many clients we have)

I am on a dedicated windows 2012 server with Hostgator and willing to change to other hosting plans or whichever is preferable to fit my requirements.