Newborn Sleep with Twins SOS

FTM to twin girls. 2 months old now.

We have the bassinet, pack and play, cribs. All the flat surfaces.

They will only sleep in a boppy.

They will sleep with arms swaddled.

If one of them is comfortable in the bassinet, the other one is not and then wakes the comfortable one.

I really really really want them to sleep on a flat surface.