This means the following: Netflix is preinstalled. However, I have not tried out whether it can be operated with a Swiss account. The app Zattoo cannot be installed. The selection is indeed meagre and intended for the region 'Germany'. This region is fixed and cannot be changed. LG Support Switzerland is 'stupid' or not competent enough to answer this question.
I then got myself the Chromecast Stick for Zattoo and Hollystar, etc.
Since the Chromecast Stick can be powered via one of the 2 USB ports, it doesn't need an additional power supply.
I also installed a wireless HDMI connection. I packed everything into a box and mounted it on the ceiling next to the beamer. The box is then as big as the small beamer :-). All it needs is a 230V socket on the ceiling and the beamer can be quickly removed (magnetic mount) when it goes 'out'.

I bought the beamer in Germany a year ago (including the filter). Netflix was an important argument; the service works fine with a Swiss account. The beamer is permanently mounted on the ceiling. Tip: I made an extension cable for the power supply with a speaker cable (8m). This way, the power supply does not have to be mounted on the ceiling. The sound is sent to the receiver via ARC and HDMI - so I don't even need an additional audio cable. In the meantime, we watch television ourselves via the beamer. The signal is sent from the UPC box via the receiver to the beamer. And films; yes, I stream them directly from my media server via WLAN to the Largo. The perfect solution!