ARM: Can I use the Amazon Web Service EC2 Ubuntu instance as a Keil floating license hosting server?

Hi, I'm Matthew. My team is considering to purchase floating type license of Keil MDK Essential for 2 users. Although there are 4 firmware developers (ARM CORTEX-M), they work at different hours. I have questions about the license type and conditions of the license hosting server. http://www2.keil.com/mdk5/selector 0. Are there links provided from Keil that describes requirements, such as RAM size or OS type, of the license hosting server? I'm thinking of using Amazo