Sounds to me you are asking for a warranty. You cannot get one, this information is not supplied by WMI or the operating system. Like much of the WMI data, this comes from a driver. The chipset driver, invariably supplied by the chipset manufacturer, companies like Intel, AMD, NVidia. They may be tweaked by the system integrator. That is however very rare, the cut-throat pricing in that business just don't allow for goodies. Or the support they'll need to provide when their non-standard query results make programs bomb.
So 99.99% of the time you'll just get a single result. Just 3 for the CPU.
Which makes the property completely useless, it doesn't contribute sufficient random data to make the hardware hash unique enough. So don't include it, problem solved.