Quoted from SantaEatsCheese:You absolutely have to remove atleast 1 of the 2nd row seats.
You can fit 2 pins in the back of a Honda Odyssey with the middle and rear seats removed, but they won't fit side by side without removing the head and turning it on it's side. You can fit 3 with partial disassemly. A pin is too wide to fit where the 3rd row is. TRUST ME.
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You can definitely fit one pin in a 2015 Honda Odyssey by just folding down the third row and leaving the second row in. I have done many times. You do have to move the 2nd row seats up a bit.