I bought an FSR kit for my Rostock Mini, though I am not sure if it is better to place the sensors near the XYZ towers or the ABC locations (?) between / opposite the towers.
I think most of the Kossel printers I have seen with FSR sensors have them at the ABC locations, though it is fairly easy to bolt them to the frame in those locations. For my Rostock, I was thinking it might be easier / cleaner to wire them near the towers, but I didn't know if this would impact performance or not.