We have 4 year old twins who have just gone to school, and I slept in the spare room for a good year between them being 1 and 2 because it gave my wife the space for night feeds and I needed the sleep, and she told me I was not much help during the night anyway and was a lot more use during the day having got a reasonable amount of sleep. If it all went horribly wrong I was always happy to get up, and did at least once a week. My wife often slept in the early evening and I stayed up late with the kids to help her sleep as long as possible, and also got up early to help her get a few hours in the morning and especially at the weekend too.
So in the evenings she would sleep from 6 till 10 or 11, I'd sleep from then until 6am, she'd sleep from 6 until I left for work in the week or until 10 at the weekend. We often slept with them on us at the weekend during the daytime naps too, that was lovely :)
Large parts of the first year (and the second tbh) were spent with all of us in bed at odd times to get rest when we could. Others will have done differently, doesn't matter if it worked for them :) The important thing is to do what suits your family best.
One of the best bits of advice we were given was to try to synchronise what you do with them, ie when one feeds, feed the other too, when one needs a new nappy, change the other too. They are different children and if they were singletons they would likely have different routines, but for your sanity and getting what sleep/rest you can, it is easier to have them doing the same thing at the same time.
Twins particularly are an endurance event! Congratulate yourselves for the first 12 weeks, the first 6 months, the first year and still having everyone happy and reasonably clean 😉
PM me if you'd like, happy to chat about the twin thing 😁