https://www.amazon.com/gp/aw/d/B000234UFG/ref=mp_s_a_1_2?ie=UTF8&qid=1480999424&sr=8-2&pi=SX200_QL40&keywords=outdoor+extension+cord+splitter&dpPl=1&dpID=41Mg6CLjRBL&ref=plSrch

I've decided to use this along with 2 of these

I also have an electrician coming to see about adding another wall outlet.

Get one of these and a second surge protector if you're under 10A total draw from the outlet.