@AndyHuan Thank you again for the questions here. Yes, you can share multiple platforms under the same login with a data feed like Rithmic. You just need to tell us the number of platforms you wish to utilize. We will enable the number of concurrent logins for you.
CQG has the ability to have access to the same account on different platforms, but they need a separate username and password for each platform if you wish to have a concurrent login. They charge $10 per month for this service plus data feed.