Well, chryssalids are not that hard to beat I found out. Keep squads of ~4 ready with auto-shot, stay far away from corners and let them come to you. Works most of the time.
How many bases is sufficient? I have one now (located in Stockholm) and I've just started building one at Antarctica to be my research laboratory. The first one will later be a attackbase (lots of interceptors with one skyranger and a crew and some workshops so they'll manage) and probably the rest too.
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