I work 8-5, so yes, I realize apple is open during these hours. I know they are open until roughly 6 or 7pm. It's the after 5pm hours, and sat/sun hours I'm interested in. So I can plan my week.
An air gap for a dishwasher is a requirement set forth by local plumbing codes. It is a device designed to ensure water flows only in the right direction during the dishwasher cycle. As a dishwasher operates, hot water flows in from the sink's hot water connection.
If an air gap is required by local code, it must be installed above the overflow level of the sink. As noted, you can bore a hole to install it. If you can get away with looping the dishwasher drain hose, that's all done inside the base cabinet.