2 PSUs under each tree (both 5v). 1 PSU immediately behind the nativity (5v). 2 PSUs under Rudolph (one 5v and 1 12v for the soundbars). 2 PSUs in the entryway/front door (one 5v and one 24v for the floods). 1 PSU on the roof (5v). 1 PSU under the Bethlehem Star (5v). 3 in the garage (two 5v, one 12v for the candles).
Because it's all low voltage I run off just 4 outlets. My electric bill only goes up about $20-$25.
As I wrote earlier, I run data separately from power on everything using a 2-wire method. I run data on 2 wire with the data line and a negative line. I run power from PSUs in various locations on 2 wire with positive and negative lines