1. Not sure about this issue, you'd better consult Cisco on this question (or company which sold you CM), but, at least at installation step it checks your platform and it must be one of the listed by Cisco;
2. Yes, it's possible; you can install failover server in your IPT infrastrucure, but you need to have license for it;
3. Again, not sure if there's a recommendation. I just make full hard drive image, just for a case;
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.