That’s an access point- you have to connect it with an ethernet cable. You probably don’t want to fool around with that if you don’t have to.
I’d look at a range extender- they’re significantly cheaper, and considering that your garage door opener’s data bandwidth requirements are probably infinitesimal, they should do the job.
Another recommendation for a Netgear extender/repeater. I’ve used them professionally a few times with good results and swapped my private Huawei repeater for a Netgear, more than doubling the bandwidth in my living room. Also quite easy to install and configure.
Of course the success depends on structural factors: the distance from your router to the garage and obstacles in the way (walls with/without metal components). Depending on those factors, it’s possible that the best place to install the extender is not somewhere at the garage, but at the nearest possible place in the house to get best results. That’s a matter of trying several places when you’ve got the extender.
I would assume it has to do with a larger concept of home automation. “Open the garage from the kitchen when you see the kids coming up the driveway,” or “Open the garage from work when the water heater repairman shows up,” etc.
I just had mine upgraded. I can open it from anywhere using my mobile phone, but that’s not the main benefit, imo. It has a sensor that reports to my mobile phone when it opens & closes, and I can check the current door status via my mobile phone. So it’s a good security feature when you’re away. And I have mentioned this feature to 4 friends, and all 4 told me they that have in the past inadvertently left their garage door wide open when they have been away. Garage doors have a force sensor that can sometimes be too sensitive, and will reopen the door if they detect a blockage - so if you don’t watch it close completely, it may reopen. Now, if I have an OCD moment where I can’t remember if I watched it close, I can just check my phone.
Before buying a range extender, consider where your primary router is. It may be relatively easy to connect it to a different point in your home that would reach the garage.
And if you go for a range extender - take advantage of the opportunity and try out various positions - you only need to make it strong enough for the garage, it doesn’t necessarily need to be very close to it. Try it out in various positions and you may be able to improve the signal in other useful parts of your property too.
I happened to purchase the extender in Bump’s link just a week ago. It works great. It was up and running 5 minutes after being unwrapped. It does slow your connection speed a bit compared to connecting directly to the WiFi router, but that shouldn’t matter much for your application.
If the bandwidth is important, there are certainly very capable range extenders for a modest outlay. I have a Netgear AC1900 that’s a couple of years old, now only $110 because there are newer and better models. It streams ultra-HD just fine to my obscenely large TV screen.