Do not expect to get anywhere near 500mbps on any powerline devices, you will get far less than the stated rate even on the same electrical circuit.
For example, I recently tested a pair of Zyxel 500mbps (PLA4205) and with nothing else active on a single circuit 6 feet apart the best they could do was 103mbps. At a distance (across the house) they were around 25-50mbps. The target computers achieved 830mbps on wired gigabit using the same cables as the powerline test ssd to ssd, running LAN Speed Test.
From many review that I've gone through, most reviewers found no enhanced speed from the 500mbps over the 200mbps models.