ᐅ Installed Concrete Junction Boxes | DALI Circuit

Hello everyone,
I now need to connect the recessed spotlights together. Is it possible to wire the spots as shown in the first image? Or do I have to follow the second layout?
The conduit would be the Fränkische FFKUS 25. If that’s not sufficient, then the 20 mm (0.8 inch) version.
For the cable, I would use NYM 5 x 1.5 mm² (5 conductors, 1.5 mm²).

Everything should be controlled via DALI.

No matter whether it is image 1 or 2, DALI handles it without any problems.

What kind of spotlights are you using there?

Ledvance SPOT ADJUST DALI 8 W 3000 K IP20 WT

Just another question... The shell construction worker installed the junction boxes but didn’t wait for me to connect them... Concrete has been poured.
Can I still drill through 25cm (10 inches) of concrete and run the cable through the ceiling?

Yes, this is also deliberately done like that in our case. Installation then takes place on the unfinished subfloor of the floor above.