Hey there, just wondering if anyone can give me some advice on using homeplugs with a Dreambox, or rather, with multiple Dreamboxes.

I've set up some sat boxes for friends before via homeplugs, but never have I set up two or more boxes at one location that would use homeplugs. Normally I pair the two homeplugs in the kit and all works fine. A friend of mine, however, has asked me to set up two Dreambox 500s in different rooms in his house (along with a wifi 800, no problems there). From what I can tell I just need three homeplugs in this case, and pair both receiving homeplugs with one transmitting homeplug that's attached to the router? But I'm a bit confused at that point, will both Dreamboxes be able to access the router at the same time seeing as they're both basically using the same lan port on the router??

I have searched the forum and I do see people being advised that three homeplugs will suffice, but I want to make sure that the two boxes can actually operate simultaneously.