i bought a strip from walmart that has about 9 plugs on it....
Larry...the one I bought from Walmart has for 10 plug ins and they are spaced apart which is perfect for the collars. The surge protector is about 3.5 ft long...I also have a second one that fits about three collars.
I bought a black wire shelf from Lowes and keep all my tracking collars, shock collars and head lamps on it to charge as needed...the protectors are tie wrapped so they won't move...