+1 for using a presence solution like the one @Angus_M linked to.
Most people find it necessary to combine multiple presence sensors into one, since mobile presence is tricky and relying on one sensor only is a recipe for failure at some point.
So while it may be beneficial to use other cloud-based services that offer geolocation to improve reliability, I agree that using IFTTT's wifi-based presence makes less sense than a solution that runs on the hub itself.
There are a few different community-developed apps that make it easy to combine multiple presence sensors inputs into one output sensor, but @jwetzel1492's Combined Presence has worked as well for me as his iPhone presence sensor driver. And I have an iPhone so that's what I call it even though it does indeed work for android as well 
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