Which LED spots are suitable for smart home connection?

If you don't have a transformer anywhere in between, then no 24V will come through.

OK, but that means if the home builder makes three ceiling outlets as an example in the living area, then he has to work with a transformer. Right?

If I then use these three ceiling outlets to connect more spots, do I also need more transformers? I read somewhere that you can hang 5-6 spots on one cable, but of course, I don't know what preparations were made there.

May I ask a question? You obviously lack the basic knowledge in electrical engineering / electronics. That's not a problem, but why do you want to do the lighting yourself then? Your electrician will know what to install and what kind of spotlights to use if you order some from him.

I have not hired an electrician but get everything from the house builder and pay extra for every ceiling outlet, and not a little either. That is why I am doing it myself. And connecting a spot, whether with or without a transformer, is not master work. It's not about whether I can do it or not, but that I can already take care of it now.

You can't do it because you lack the basics. It takes far more than just buying a handful of spots at the hardware store and then clipping them somewhere.

Since you also ordered a "Smarthome," they should somehow then light up or be controlled. Or should it just remain decoration?

Actually, I see three ways:

1. You come out with the necessary info (number of spots ordered, number of spots desired, wiring ordered, wiring desired, type of spots ordered, control ordered, and and and everything, really everything concerning the topic of spots)

2. You hire an external electrician who implements your wishes.

3. You order everything as desired from your prefabricated house provider.

Only like this and no other way... everything else only leads to botch jobs, problems, additional costs, and possibly to a non-functioning system and in the worst case to a fire...

und bezahle für jeden Deckenauslass extra und zwar nicht wenig.

Welcome to the adventure of building a house...

I think that's a troll... the OP definitely can't be serious...