We are designing a cloud environment with multiple instances. I would like to know if it is possible to buy a CF Standard/Enterprise license that include the possibility to use it on multiple servers.
You need to review the end user license agreement: http://wwwimages.adobe.com/content/dam/Adobe/en/legal/licenses-terms/pdf/Adobe_ColdFusion- Multi-20140214_1311.pdf
See Section 3.1.2, for a standard license:
a single VM instance for each valid license of Production Software that Licensee has obtained, as long as the number of vCore/vCPU assigned to such VM is less than or equal to two