When using Märklin H0, it is a bit of a challenge to make industry or port facilities when it comes to the road surface, because it is difficult to find a good solution with the power supply for our the third rail.

I ended up choosing an N rail and Auhagen cobblestone plates with strips of 6.5 mm on each side of the N rail + same plates between the tracks.

Both are 1½ mm and it fit with 1 mm Evergren glued to the sleepr

But getting the thin N rail down to the height of the center conductor is difficult.

I have often searched for a solution with a conductive center conductor, as on Märklin's turntable 7286, so that you only cut into strips, but never succeeded.

Have seen other solutions with nails or with Peco SL-17, but they could be nicer.

So do you have a suggestion for a better solution?

Sure, trickier things have been done. I have an intermodal yard planned for my new layout. Not big, but I got a Walthers ho scale Cornerstone yard pavement kit ite, #933-4120.
It has crane ways, and pavement for trucks with drains. Also track crossing ramps. Not sure if it is made in N scale. It is not expensive. It's molded in grey. The sections can be custom arranged for your size and configuring. It has several sections included.
Their kits are nice, and some made by Kibri, like the Scenemaster contaioer cranes, and reach stacker. This is from Taiwan, like their shipping container tank kits at $7 or $8 each. Their 20, 40, or 45 foot containers are nice too. Many carrier names for both.

so if using 3 rail track (C or K?) there wont be much room for the rail you are adding for the pickup. Perhaps the problem you were alluding to....

if you took 2-rail track and then added the N rail down the middle (thus adding the 3rd rail) perhaps it would not be too high...

The diameter of brake cable is actually 1,5 mm