I like to keep mine horizontal, keeps more in the fan slipstream for better oil cooling.
I find there's only about a tablespoon loss of oil when changing after engine shutdown for about an hour. Half the oil in the filter drains very quickly into the valve chamber. Just hold a rag or paper towel under the front of the filter while you quickly spin it off.
You can fill the filter about half way with new oil and spin it on without spilling.
Best part about the filter is it gives another quart of oil in the system.