I have four adapters in my house, I have one TL-WPA7510 and three TL-PA7010. They are sold as pairs so when I wanted the version with an access point built-in,

I have four adapters in my house, I have one TL-WPA7510 and three TL-PA7010. They are sold as pairs so when I wanted the version with an access point built-in, I had to buy another wired version. But, you can add them individually to an already existing network. The Homeplug protocol is a standard so as long as you buy the right versions, you get max performance. These things are great. I have one in the basement for the Verizon router to plug into, one on the second floor for my PS4, the AP version behind the 4K TV in the family room, and another at a desk in the guest room. The Verizon router has a lot of interference nearby so quality is poor in some spots in the house. Quality is good, it sometimes reaches gigabit speeds but it's way more robust than wifi extenders. The apartment I lived in previously was built like a brick shithouse so wifi dropped off pretty fast once you got to the other end.