We had two moses baskets upstairs for the twins to sleep in, and a crib downstairs that they shared for day sleeps, though one often slept in a bouncy chair. This didn't last long though as my twins HATED each other and just punched each other and disturbed each other. After we separated them they slept much better. They are now in two separate moses baskets downstairs and two separate cots upstairs. Meant they had to go into their own room at about 6 weeks as we can't fit two cots in our bedroom (who can?!?) but as Granny was staying and helping during the night this was probably best as I'm sure my DH didn't want his MiL wandering into our room at all hours of the night 
Congratulations on the twins. There's a lot of people chatting on the multiples threads if you want to ask questions.