The function is available. But I have not tried it...

Yes, the router's CPU is too weak to route complicated settings at the full 1 Gbit/s. The same applies to the sister product USG. Only the UDM can route higher speeds.

ja.

Page 6: Power Input 24VDC, 2.5A Power Adapter (Included) https://dl.ui.com/datasheets/edgemax/EdgeRouter_X_DS.pdf https://www.unbxtech.com/2019/02/unboxing-ubiquiti-edgerouter-x.html - - - - - - - - - - - - - - - - - Digitec (or any other Swiss dealer) is obliged to supply electrical equipment with a Swiss plug. If the device is delivered with a foreign plug, a suitable replacement cable must be provided if the power cable is plugged in or, if the power cable is firmly connected, a suitable adapter must be provided. If the appliance is delivered without a suitable plug, please contact customer service and ask for a cable or an adapter, free of charge. Digitec info --> https://helpcenter.digitec.ch/hc/fr/articles/4402084170386-Adaptateur-manquant #1 --> https://www.esti.admin.ch/fr/themes/faq/materiels-electriques-surveillance-de-marche

I don't have a fibre7 internet connection, but I do have a gigabit connection from Cablecom. I only have the Edgerouter X as a backup, as it is not able to route the full gigabit speed as soon as a few security features, such as IDS/IPS or somewhat more complicated configurations, such as link aggregation, are used.

Ja, gemäss Datenblatt: OpenVPN Site-to-Site and Remote Access

I assume you mean PoE? You need a stronger power adapter or a separate PoE supply as stated on the manufacturer's page: "*Requires 24V passive PoE or a 12W minimum power adapter (not included)". The EdgeRouter X alone has too little power.