I want to use this bulb socket to supply power to a transformer for low voltage lights outdoor. Is this safe?

I use these to connect the lights in my garage to my garage door motor. They work fine for the past 2 or so years. The only concern is outdoor outlet needs to be gfci.

How is the transformer secured? A 45w transformer is pretty heavy, I wouldn’t rely on the plug prongs holding the weight.

And like already mentioned, if it’s outside or in a wet location it needs to be GFCI (esp. since the transformer can’t be grounded with that).