Alvin, not to put a damper on your choice of the Innuos as such, but, depending on the size of your music file library, (and what processing you might want to do), the Zenith Mark III with it’s Intel Quad core Pentium N4200 CPU is a lower spec than the minimum recommended by Roon (Intel Core i3), and as such is likely to be severely underpowered as a Roon Core for anything but the lightest load.
I highly recommend you browse through https://community.roonlabs.com/ before you decide on a Roon Core platform.