The easiest place the get the HC and MC versions is the Info tab of the driver. A CGX should be fine with any recent NexStar+ HC.
One way to tell if the guiding is working is to send guide commands from the Indi display and look to see how the Ra and Dec position changes. At the default 50% rate a 2 second guide command should change the Ra by one second or the Dec by 15 arc seconds. That will work indoors.
More information will need a log file showing the commands, enable mount logging in Ekos and Debug logging in the driver.
I see, Ekos reports version 7.15 for RA/Dec version, despite CFM / Handset Versions. And yes - looks like Guide Command from the Ekos control panel affect position. Will give it a try when weather permits.
Thanks, and sorry for hijacking someone else's thread.