Pay to earthquake proof their building and give them a bit of extra money on top. It's not that hard. Have a sort of auction to see who in the vicinity it willing to accept the geothermal plant for the cheapest.

Keep in mind that Germany has plenty of open pit lignite mines. Like eg https://en.wikipedia.org/wiki/United_Schleenhain_coal_mine

The disruption from geothermal is minuscule by comparison.