This is actually smart by RLC. A lot of us don't really watch the B# apartments. Roxy does have a following, so injecting her into B4 might get some of us Roxy followers into watching the B# dramas.
If it only took him 3 days to cheat on her with Tatiana after moving into RLC, it's probably a safe assumption he's got side chicks outside RLC too. Probably gets to her every now and then. Who knows why she puts up with it.
From what I've seen in other apartments, they just run CAT along the ceiling edges and use cable covers. Nearby power outlets probably dictate where cameras go, somewhat.
Last week when Park was trying to start a threesome, when Park tried to get touchy feely with Frisky a couple times, she literally got up and ran to the otherside of the room.