Man, we get asked this a lot, and the answer is, it’s tough. The first thing to determine is whether you want to have a separate camera on both babies. It’s certainly possible to have one camera cover two cribs (though you’ll definitely sacrifice clarity by moving the camera back far enough to view both cribs, especially vs. a bird’s eye view option.)
Next, you’ll need to consider whether you want a wifi baby monitor for twins that allows you to use your iPhone, tablet, etc as the parent unit. If you do, consider the Nanit Pro Twin Pack. You’ll get two of our top-rated baby monitor and save vs buying them individually. Do note you’ll only get background audio from the camera that you’ve switched to, but you’ll get alerts from both, and if your babies are in the same room and close to each other, which camera has the audio feed may not matter that much. More recently, Nanit added split screen in the app, so you can see feeds side-by-side
If you want a non-wifi baby monitor option for twins, we like the Eufy Spaceview or the Summer Infant Pixel Zoom HD. And Infant Optics DXR-8 (note we particularly do not like Infant Optics based on our own testing, but it does support two cameras.)