@PatchyFog 

thanks again!  I might've screwed the wiring up because the first time I connect the HS210 nothing was working. 
Am I supposed to have only one hot wire on common and the other 2 on travel? Besides the obvious neutral and ground?

  @rv75 Yes, it almost certainly sounds like something is wired wrong. If I had to guess, I'd say that one of the travelers has been swapped with the load wire in the load-side box. (You'd have to beep it out with a multimeter to be completely sure.) This assumes all was working before the HS-210s were installed.

Despite what people say, 2 HS-210s are never "required" -- in fact, the 2nd one doesn't really add much to the system beyond an aesthetic similarity.

  @rv75 4-Way switches don't have an on or off. They have a "this" or "that." They also have a long break-to-make time that can kill power to any Kasa downstream. Check out my video. The animation at the start may be of help. https://youtu.be/kMT7KUVTELo

  @septer012  Does the 4 way switch need to stay untouched?  I'm having trouble once I move the 4 way switch to on/off

  @RichG5 Is it dimmable smart switch, the one you replaced? 

  @xRkYqUz Have you got answer of your previous question? 

  @board4mic May I ask have you tried on any dimmable smart switch to realize a 4-way switch? 

  @PatchyFog thanks, got it figured out. Took a multimeter and a few hours of trial and error. Ended up being the 4 way paddle switch from Amazon. The switch pattern is not same sides and the crisscross. It is same sides and then same ends. So I had to put the travelers diagonal to each other. It was an enerlites paddle switch.

  @ejayb A 4-way switch won't function at the end of the circuit -- and the Kasa 3-way will suck power from any active line, so it is hard to disrupt their juice. You're probably going to have trace wires with the juice off; but another approach would be to put 1 Kasa in at a time and see how they behave. You might find my video helpful: https://youtu.be/kMT7KUVTELo