Technically speaking every two months from a month of 31 days would be a month of 31 days although this gets screwed come July/August as both have 31 which means the second month from July would mean every second month from that point would be 30 days.
There is a way only it's probably not what you expect.
Choose something like this:
Basically it will run every 2 months on the last Monday (or whatever day you choose). It removes the need to rely on the 31st as it will bring it back to the last Monday of the month which should fall within the same week.
It would be good if there was an option for the last "Day" of the month so the only thing I could suggest is post in the Apple Support Discussion to request this feature. Until then the suggested method is your best bet.
Oh and just for your information here's a trick to find out how many days are in each month.
Clench both fists together and place your fists together (thumbs in). All knuckles are 31 day months and all hollows in between knuckles are 30 days except February which as you know is only 28 days or like this year 29.
Bets trying to remember that rhyme which I can't remember so clearly rhymes are a dumb way to remember.
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