For standard Flat Back urinals, yes. Privacy partitions (dividers) are recommended between units.
Smell comes from the trap or dried urine. Ensure the flush volume is sufficient and use Urinal Screens (mats) to reduce splash and odor.
Yes. You can use a standard push-button valve or a sensor. Sensors are preferred for hygiene.
Yes, but since urinals are ceramic and heavy, the partition must be reinforced with a strong internal frame to hold the weight.