I assume you read the other thread on this topic that was mentioned - From my own personal experience everything that is mentioned is spot on.
I would put a finer point on a couple of things…
There is the standard “noise” generated by the trainer - what you hear, what DCR and GP Lama capture in their sound tests. I have a Tacx Neo, and it’s darn quiet, hasn’t ever bothered my sleeping wife and kids. I am sure the new Kickrs are effectively the same.
The issue for me with the neighbors is the vibration transmitted through the floor, and that is really dependent on the construction of your building, what you have under your bike (mats, carpet) and likely a bunch of physics that are over my head.
My mistake was not thinking about it, plopping the trainer right down on the hard wood floor and hammering away and thinking since it was “quiet” that it actually was quiet - bad call on my part, and generated some friction with the neighbor.
There are some comments in the other thread about being strategic - thinking about what room is below you and timing (among other good tips)… The only thing I would emphasize on top of that, is to start out with your best shot at insulating and minimizing disturbance from the outset. Once you get on your neighbor’s radar, it’s quite hard from them to become suddenly “unbothered” despite your best efforts…
Honestly, with a Kickr 2018, and some good foam insulation (or foam over carpet?) I really doubt you’ll have any trouble. Let us know how it goes.