What are you currently using for your habitat set up now – is it an xpen? If it is, (I do and mine is 4×4′) that pretty much determines the area that is covered. If you want it twice as large, or one square shaped with a long tunnel-like addition attached, you can get a second xpen and attach them to each other, with one or two door openings. But I’m guessing that will be too big for your room.
Do they climb, or like to jump up? If you make an enclosed pen with cubes, they can each share different levels with a smaller footage at the bottom. I think once they know the routine, they will be within the cage at night and just need the litter, water, and hay accessible while they have areas to sleep. Open for the rest like food and playtime.
If you are worried about the new rug, get several flat seagrass mattes and tie them together with sissel and lay them on top of it where the bunnies stay. I did that, and it’s held except where Sammy decided it was delicious, and prefered sleeping on the rug under her basket. So she chewed on it, but it’s been months with only minimal area of rug exposed. Meanwhile, most of the rug is protected. It’s smooth and cool for her, but my vet had me get it to be a good surface for her feet.
Peruse the bonding section as well as this one for more ideas on habitats for multiple bunnies.