@puternut 

Hi, for your issue, please take the below answers.

May I know if your whole house use the same power electrical meter?

Since our powerline devices can only work under the same power electrical meter.

If your whole house is, you can use the powerline device without issue.

You need 4 Ethernet connections in 4 different rooms, which means you need 5 units to use together.

One is a main adapter which is connected to the router and send the internet, the other four units are used as receiver and provide internet for your devices.

Of course, you can buy two kits of TL-WPA7510 KIT and use together.

Please don't worry. All of our new powerline devices can be paired together without issue.

Note : If the AV1000 powerline product and AV600 powerline product is used together, their powerline rate will be limited to 600Mbps.

Hope it can help you.

Have a nice day!

@puternut 

Oh, I am sorry. I misunderstood your requirements.

Since you said: " I am looking at the TL-WPA7510 KIT as a starter BUT I need 4 Ethernet connections in 4 different rooms ", I thought you may need one adapter and additional four extenders in four different rooms.

If you need 1 an Ethernet connection to the router, #2 to PC number 1, #3 to PC 2 and #4 as a possible Ethernet but probably to a laptop/phone via Wi-Fi, you only need four units. That's right! And the two kit TL-WPA7510KIT can handle it.

Hope this information would help better.

Have a nice day!