I played this game solitaire today and I agree with this:
It makes little sense to have a numbered entry hex for the solitaire game in which you then move the incoming lander clockwise 6 hexes. That turns the 6 entry hexes to only 5 entry points.
I place the incoming lander in the proper numbered hex and then, on the following turn after activation, have it attack the hex it is in and turn it to rubble.
Only I played it different:
When I placed the incoming lander on a hex where Martians are not allowed to move into, I first place a Rubble marker. (I think this complies to the rules more).
In the next round it gets activated, can attack the adjacent hex (Rubble marker), and move into that hex.