11/23 i meant (5 collectors, 1 blaster)x(3 times). then once you have occupied the space up you can build a mortar to complete your defense. For the first spores you won't have SAM's. but once you survive this you're in very good condition.
11/23: you can build 5 collectors, then one blaster. then 5 more blaster and one more collector. the trick to survive spores is to create a sufficiently connected network of collectors so that it stays connected even after spores destroy 1-2 of them.