Staircase light Tutorial and Blank Screen Error for WIFI Settings

I have a straight staircase how do you do the wiring so that it’s nicely hidden? Do you have to tear a bunch of stuff apart or is there an easier method?

Also is there a way to use like a laser break or something other than pir? I currently have this setup going.

It works okay but the pir sensors can be finicky or difficult to get it working properly. It works most of the time though. I would much rather do the lights under the lip of each step.