I have 2 Nexx Garage door openers. You attach them to an existing door opener. The phone app reminds you if you leave it open. You can open and close them anywhere. I had an issue and opened my garage door for my neighbor from here in Wisconsin. You must set them up on a 2.4 ghz wireless network. Most routers including Xfinity will work on 2.4 Ghz, BUT Xfinity sets them up for 5 Ghz. You need to have them turn on the 2.4 Ghz on the router. It will get a separate name but can use the same password. If you have your own wireless router you need to set that up if not already done. The phone app for Nexx is pretty cool. They have videos on how to install and set up the opener, and they are pretty good. They are also smart device compatible.
Nexx Smart Garage Wi-Fi Door Controller NXG-100B | Nexx