Each CUA atom adds one prefab to the scene, so you need a CUA for each furniture item.
Recommendation would be to setup one single CUA and then duplicate that again and again. You can duplicate atoms using AcidBubbles Keybindings plugin. Once duplicated, you can choose another prefab form the dropdown menu, the assetbundle would already be selected.
If you got modular objects that need to be aligned on a grid, I would also recommend my own PowerHandles plugin. That allows you to just hold a hotkey to snap the atom to the grid while moving it (e.g. 10cm snap). The modular SecretRoom environment is a good example where that apporach would make sense.