Update:-
Eventually I got my new appliance with 2.5 Gb/s LAN ports and likely it works flawlessly with OPNsense !
I'm using an mSATA SSD and there is also a mini PCIE slot, see picture, so my question: since I have a second identical mSATA SSD, I should be able to use it by installing an adapter like this one, is that right?
https://www.amazon.co.uk/JMT-3x5cm-mSATA-Adapter-Converter/dp/B0817PW5DN/ref=sr_1_69?crid=257JK1PY06R2G&keywords=mini+PCIE+to+msata&sprefix=mini+pcie+to+msata%2Caps%2C200&sr=8-69
or
https://www.amazon.co.uk/Bewinner1-Adapter-3x5cm-Converter-Laptop-default/dp/B086TT6PYC/ref=sr_1_8?crid=257JK1PY06R2G&keywords=mini+PCIE+to+msata&sprefix=mini+pcie+to+msata%2Caps%2C200&sr=8-8
My concern is that both those adapters description mention Asus laptops ??