(((S.))) The fun is just beginning! =)
My twin boys started climbing out of their cribs at 15 months old. Eventually I put them in toddler beds, only had their beds and a small table in their room (along with blankie and a fav stuffed animal) and just shut the door and hoped for the best. That was 8 years ago, and we didn't have Mamasource for advice, so I never thought of double gating the door which would have probably been a lot better than shutting it! I would shut the door and wait for them to just fall out. (asleep) Sometimes they fell asleep in their beds, sometimes they fell asleep on the carpet, sometimes they fell asleep in the same bed together.... I didn't really worry about it as long as they fell asleep. Eventually as they get older, they'll stay on their mattress or beds (or venture to their brother's bed sometime in the night, which is always cute).... but I wouldn't stress about that too much for right now. One thing is for sure... with toddler twin boys, there is never going to be a "piece of cake" peaceful routine that goes just as planned like in the books. Twins are a different breed from singleton children... they just are. (even when they're 9 yrs old lol) My best advice to you would be to find a solution that keeps them safe (like making sure there's nothing in their room that they can get into and gating the door) and just ride it out. Eventually as they get older, it will get a bit easier.
Best of luck to you! Twins are a lot of fun, and you have many adventures in store for you! ;-)
p.s. I don't think that separating them (like the other woman suggested) would be a good idea. They need each other. =)