taiwanbbs.org/cgi/index.pl?b=mil,m=1125132194,s=360
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Each squadron in ROCAF alert status board, which always has different level of alert birds in alert stand-by status, be it Alert 5, 10/15 or Alert 30:
Alert 5: 2 or 4
Alert 10/15: 4
Alert 30: 4
Let's take it easy, 2 Alert 5 birds, 4 Alert 10/15 birds, and 4 Alert 30 birds. That's 10 fighter.
Since you already know there's typical of 3 squadrons in each ROCAF fighter airbase, so unless my math is wrong, 10 x 3 it's 30 fighter per airbase.