We have this one, would recommend x https://amzn.eu/d/2FFy4ZQ
I use a babysense monitor and I highly recommend it. My screen was playing up after nearly a year, so I contacted customer service and I received a brand new monitor the post the very next day free of charge. Their customer service is brilliant and you can see both babies at the same time with the spilt screen option, have a look at it and see what you think.
Babysense hd is great, been using ours for nearly 3 years and it works perfectly still
Babysense
Littokom, if you don't mind a wifi one. I can see both baby breathe on it
And their cheapest one is like 16? And 2 for 26
“Babysense 5.5” 1080p Full HD Split-Screen Baby Monitor, Video Baby Monitor with 2 Cameras and Audio” it’s like $160 on Amazon- it’s not a WiFi one, you can only view on the monitor, and it has a single or split screen option, and a temperature monitor. The cameras have to be plugged in but the monitor does not. The cameras also can act as a noise machine or a night light.
Babysense