Main panels usually alternate legs down each side, so if you put a two pole in, it would work.I did some more reading yesterday cause it made no sense to me why all the guys setting up a 240v compressor used a common 2 pole breaker. Turns out I had the 2 pole breaker installed incorrectly. The way I had it installed was to use it for 2 120V circuits. It does send 240v volts by line 1 and 2 but it has no way to alternate the current to allow the motor to run. The way I need to install the breaker is like in the picture so it can alternate the current. I had the breaker installed in between the dividers.
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Yours looks like you could pull from the same leg. Could create a short that way.