Recurring Meeting set up

@dlawhorn There isn't a way to specify it that granularly with in the Zoom web portal, however, you should schedule it as a "No Fixed Time" recurring meeting. If scheduling from the desktop client these meetings will automatically be "No fixed time". 
The best way to handle this would be on your calendar's end. With it scheduled "No fixed time" in Zoom and scheduled for the 1st and 3rd Mondays of every month in your calendar, your users will be able to join and not know the difference. 
You also won't have to worry about scheduling to the 50 meeting limit since this will technically not have a time associated with it in Zoom. 

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