OK I'm confused!!

We've just given 2 years worth of rent cheques to our new landlord... From what I'm understanding, he could go on the 13th and cash all 24 cheques 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?!