In terms of it looking weird, I'm 28 and I live with three adult roommates. Two are married to each other and share a room, the other roommate and I have our own rooms. No one assumes we're all involved with each other as far as I'm aware, though the other single roommate and I *have* both screwed the married couple at various times, as it happens.
None of that is to say that it's a good idea to move in yet, in terms of the dynamics? But I don't think people would necessarily question it, especially in this economy. And if someone did ask a question, you could always just roll your eyes and stay silent. In a way it might even be easier to discreet, since you wouldn't have to leave your own home for a sleepover date!
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.