@board4mic 

I am trying to follow the 4 way switch hook up. So when installing the two kasa three way switch do you hook up the white common or is it left out. Looking at the diagram it is not hooked up. Any help would be great thanks

@HappyKing 

What's a laser wire?  

@Chicago_SH confirmed to work. Just followed directions, placed it in the 2 switches that have laser wires. 4 way has 2 red and 2 black.. where as 3 way has 2 black and 1 red. Went through the pairing instructions. Worked like a charm. Thanks for putting those directions.. I think TP should publish this to avoid searching. I don't know why some say it's not working .. 

@Chicago_SH 

So If i understand this correctly, you don't need a special companion switch or something. Just replacing the normal 3 way switches from Kasa you can continue to use the mechanical switch  for the 3rd location in a 4 way config? 

Has anyone tried 4 way with KS230 3 way dimmer switch?

This is how I feel. I want all of my switches to look the same. Each of my switches (5 of them to control one light) are all located on a 3- or 4-gang switch box, so having one of them different drives my OCD nuts. Don't like it at all! I'm going to try to make the 2 switches that are not on the ends of the circuit not part of the circuit, so I can have a 'smart' switch that triggers the 'actual' switches via automation. Hopefully that will work.

@board4mic I have this setup and it works for me. I REALLY wish there was a four way switch to replace the dumb switch, as I want all my switches to match.