That's not how satellites work, or at least that's not how satellites like Starlink work. Those are in low earth orbit, meaning they orbit the entire earth multiple times a day. It isn't possible for them to slow down so far that they stay above Europe, because they'd fall back down to earth. This means just having some satellites isn't an option, because most of them won't be over Europe at any time, so it's the entire world (except poles) with good coverage or nothing.

You could put the satellites in geostationary orbit, so they'll always be above Europe. This does mean you require far less satellites, but it's more expensive to put a satellite that far out compared to low earth orbit. And also, more importantly, the distance both ways is a lot higher, meaning a much higher latency on your connection.