Can I connect two gadgets to one powerline Ethernet adaptor?

Thanks for your review of the Netgear HDX101 powerline Ethernet adaptor. It's more technical than most I have found so far, but I have a question about it.

I have two HDX101s and I'm very happy with them. I was wondering if you know whether it's possible to have the following setup. Modem to router then router to server and HDX101. The other HDX101 is connected to a switch/router in another room, and a PC and Xbox connected to the switch.

I'm trying to work out a way to connect two devices to one HDX101, or be told it's not possible. Then I can stop trying!