Does an AAV have to sit directly in vertical line with a drain going through floor or can the vent be routed a bit to the side? Current through floor drain is off-center below sink and if I place an AAV directly over the the drain, I can't really go up much before hitting the bottom of the sink. If I want my AAV to be at least above the sink strainer, I need to route the AAV such that i will no longer be in a straight vertical line with the existing floor drain location. Is this possible or should I reroute my entire drain location to a place where the AAV stack can be properly high enough? Thank you.