Chelsea,

he could go on the 13th and cash all 24 cheques, This

Yes, Full amount.

and he'll get a portion (for example 90%) of 2 years worth of rent in one lump sum from the bank. The bank will then take out my rent from my bank account each month to pay themselves back and then they earn 10% commission?!

NOOO

I have not read any where such arrangement with Bank.

So make sure your landlord continue to deposit monthly basis as he should be, ethically.