Not if you are screwing down the tracks. There may be possible interference of current and digital signals. Do one long section and test it out.

If you run your wires from both track and switches under the M track won't that require a lot more wire? How do you collect all your light wires and power wires from switches into distribution strips if not under the board? I run k track now but I did run M track for years and everything was under the board. I organized things using plastic wire holders and staples to channel the wiring.

My advice is:

Choose a color for center conductors + rail ( red & black/brown will be suitable ).
Use a drill with a suitable thin drill for a wire from a rail + one from the center conductor, which is soldered on.
Drill the two holes below, where the rail should be.
Down with the two wires (Use long wires of 2-4 mtr, so that when you have solder, there is for the next wires.
Under the table top you have drawn 1.5 square meters of solid wire (again in red & black/brown) and to these two you solder 2 thin wires.
Keep the two wires separated by 5-10 cm and insulations are unnecessary.
Use soldering and forget about anything with screws!

This is how you continue with wires from the rails every 1-2 mtr.

I want to make it simpler, because those boxes cannot be soldered in!

Instead, I will drill suitable small holes with e.g. 10 cm gap in the cross boards, which are normally part of the table construction and pull the continuous ring wires through (red & brown for the digital and maybe yellow & blue supply current for switches and signals).