I would say whilst getting into a routine stick with 3 hourly feeds. If they are not as ravenous they are more likely to be patient when waiting their turn. If this works then you can try spreading the feeds to four hourly but think about how often you eat or drink during the day, probably more like 3 hourly so your twins might prefer this up until they start solids. I started with first feed as soon as they got up which bought me time to eat breakfast, then would aim to start a feed about half an hour before I had to go somewhere (like to pick up my older kids from daycare) but if you don't have time constraints like this then you needn't be as rigid. I fed around 3 hourly but it could be more or less depending on where I had to be and they had to fit in around my older kids with school/daycare/activities.

I am a big believer in not tandem feeding twins unless you are really good at it. It takes longer and is less satisfying for you and your babies. They will learn really quickly to wait their turn, even at 3 months. And as you are right there you can shush them or rock them so it's not like CIO where they learn to be ignored. Ideally I wouldn't let a child grizzle whilst waiting for a feed but sometimes with twins I had to. I breastfed them to 22 months so I must have done something right