WAC104 setup as extension of CenturyLink C3000z router

I have a CenturyLink C3000z router with it's own built in wifi. Router located in the basement and I have CAT5 from there to upper floor in house, where the C3000z wifi signal is weak (too much wood and steel). I want to use the WAC104 as a wired "remote antenna" (I'm using these words intentionally to avoid "repeater" and "extender" that have specific meanings I don't understand and I don't want to confuse things). 

Primary goal: ubiquitous, strong, single wifi network in house across 3 floors: so that laptops, TVs, door bells, smart speakers, printers, mobile devices all share printer and screen mirroring resources. 

Secondary goal: squeeze as much speed out of the ethernet from router to my third floor WAC104 to a bandwidth intensive desktop.  C3000z -> CAT5 -> WAC104 -> CAT5 -> Desktop.

I'm a dummy. How do I do this?

C3000z IP: 192.168.0.1 / DHCP Srv=Yes / SSID: <name1> / Pswd: <Z> / 5Ghz: Channels: X, Y

WAC104 IP: ???? / SSID: <name1?> / Pswd: <Z> /  5Ghz: <not Channels X,Y>

Is the above correct?

What other WAC104 settings do I need to change from Out of the Box?

Thanks in advance.