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I’ve pulled Linux boot drives out of one machine to stick them in a very different machine (e.g. from a 6th gen Intel i7 with an AMD GPU to an AMD 5950X with an NVIDIA GPU) and they almost always just work or require only minor tweaks. Chances are it will be fine.
That one depends on the company installing it. When I got it installed they asked me exactly where I wanted the fiber to terminate and ran it through the house to an outlet under my desk. So let them know and they might put it where you need it.
As for the router, I recommend buying a mini PC with at least 2 Ethernet ports and 4GB of RAM and running OPNsense. It’s great and will give you all the control you need. Or you can repurpose any old PC you have lying around and just add some Ethernet ports on a PCIE card.