Different INSTALL-directory structure for different installation methods

Well, “gnuinstall” would only be needed if you installed it into some system directories (e.g. “/usr”).
I would stay away from it, if I were you (I prefer the “old fashioned” structure and then many additional tools, which use ROOT, may choke on it when it is “gnuinstall-ed”).

BTW. I think you should be prepared to keep several different ROOT versions under “/opt/root” so you’d better try something like “-DCMAKE_INSTALL_PREFIX=/opt/root/6.20.04” (and / or “/opt/root/6.23.01”).

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