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As long as there are no windows withing 10' of the stack termination you should be ok. The concern is that anything within 10' can affect the draft if this is a gravity vent (not a power) unit. the general rule is 2' above anything within 10' but the manufacturer's instructions supersede this rule
I'd take a shot with the inspector. If it's not obvious he's unlikely to go up on the roof and measure it. Just don't say anything to call it to his attention. Worst case he'll make you move it. Best approach with inspectors is to say nothing unless asked. I've been on jobs for other work and called something like this (already existing) to the inspectors attention and they usually just wave it off.