If your GPA is not where you want you, you might consider adding an extra year to raise your GPA. Not what you were asking, but if the LSAC recommends an addenda, then I would add one.
I would say you should still do the addenda if it asks if you have ever had an academic warning issue. If you fail to answer yes, when it applies, there could be future C & F issues from my understanding.
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Should I keep the two addenda separate and attach two separate ... addenda or upload it as one ... be two pages. Keep your addenda short and to the point ... the second section on your addenda to your LSAT.