Should you be using a LiftMaster opener I suggest adding a direct solution that does not use HE. I set this up prior to using Home Automation. It saved me from many return trips home to check the door, and returning home to open garage doors. I have mine set to close after 5 minutes.
I use an 889LM to auto close your door locally (one per door wired) and one 828LM gateway if you want to control a garage door from your phone. The MYQPack: 1 889LM 1 828LM may save a few dollars.
Also prior to purchase verify your opener model is compatible.
Once this is working I would add a Samsung Multisensor to the door and use this My Q app
