Q1 Does median just sniff for Methane?
Median will stay working long after the rover has left the area looking at the weather interactions between close nodes long after the rover has departed. The subtle differences will tell us how the weather works at a macro level.
Q2 Are the spikes a threat to a rover landing?
No. The penetrators will land ahead of a rover and the rover’s mass will simply bent a probe to the ground if it happens to land on one. Median will not be in the landing area of a rover. It will have to come and pay us a visit.