All right, sorry I am a beginner in this field (there must be an introduction for newbies somewhere but couldn’t find it).
I just noticed that the MC/EM devices are modems that provides connectivity, but do not hold the SIM card. The SIM has to be provided by some surrounding hardware, e.g. an USB-PCIe adapter.
In that case (RSP architecture), it would mean that I should get an eUICC on plastic card, right?