Unfortunately no. You cannot set up ESM redundancy between two combo boxes, same applies to the ERC component (HA in this case can only be achieved between two physical ERC's), and if you also have a combo running the ELM component, you cannot have ELM redundancy between to combo ELM's either.
Huge apologies to the delay in replying, didn't get a notification for some reason and have been busy out on projects. Answers to your questions below!
1. Do we have any option to put ESM, ERC or ELM in Active-Active HA mode or all of them can be configured only in Active-Standby mode ? They are all Active-Standby, the ERC (Physical only and configured as a HA Pair) will failover as it's a true HA, the ESM and ELM require manual faliover
2. Can virtual ESM or ELM be configured in HA ? You can have a Primary/Redundant model for both on a VM platform, they don't need to be pyhsical appliances
3. Can we achieve HA in ACE if configured both in same mode (Real-time/ Historical) ACE doesn't really have any kind of HA capabililty (Physical or Virtual (in answer to your next question also)). You have a real time ACE and you can have a Historical ACE, now, that's not to say if the Real-time ACE failed you couldn't recover settings to the Historical and make that a Real-time, I've never had to do this, but a seperate Historical ACE is acceptable for use as a 'backup' ACE if needed.
4. Can we achieve HA of two virtual ACE ? See answer above
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