The power supply draws the power via a PCIe 5.0 12pin connector I use this power supply on my asus rog rtx strix oc 4090 and the power supply fits into your LIAN-LI O11 case the power supply is a standard ATX power supply according to info from your LIAN-LI O11 the power supply should fit in without problems I hope I answer your question
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If the Schuko plug is included, you can easily order a Schweizwru cable here at Digitec. Completely free of charge. About the housing: The dimensions are standardised. The power supply fits perfectly. However, the display on the side of the power supply unit will not be visible, as the power supply unit is installed vertically in a slot at the back.