ᐅ Empty conduit box recessed in screed with cover and cable entry

Good morning everyone,

I am looking for an empty conduit box for the screed, into which I can insert two empty conduits (for possible HDMI, network, or power cables). Unfortunately, I only find regular floor boxes for power outlets, and if I do find something suitable, it usually costs at least 150€.

Does anyone have any advice?

This stuff is really expensive.
We were also planning an in-floor box for power and network in one spot. The electrician wanted over €400. The actual fitting already cost over €300 online. So it was reasonable (metal, tileable cover, etc.).

So again, yes, this stuff is really expensive.

Okay, then I have to come up with some kind of DIY solution. I’m not paying for that...^^