Christmas lights

I want to control some regular and some LED Christmas lights. I was thinking to get JBtek 8 Channel or Kootek 8 Channel from Amazon.I don't know what is the different between two of them. Seems both of them are the same. I tried google to find simple music Christmas light for my house. I didn't want to spend a lot of money. Is there a way we can control Christmas light with two Arduino board. My house has two stories. I would like to use first Arduino on first level and roof porch and use second Arduino on second level or top roof. I don't want to use too many extension cord. I was think if it is possible to have two Arduino boards with ethernet port and 8 channel port. I will use two long ethernet cable to small router switch to main computer and let computer control two Arduino. Is that possible? If not then I am open some suggest.