XM Unit advice (General electrical advice actually....)HELP!

Ill get to the point. I've already done and add a circuit for my GPS into my ingntion fuse and wired in a 12V Cig adapter. I am currently about to install my XM Onyx and want to hard wire it as well. Can I A) Slice into the add a circuit line and run another 12V female adapter B)simply plug in one of those 1 into 2 cig power adapters from wally world, or C) just do and wire tap into one of the factory 12V outlets, place an inline fuse and go from there. Keep in mind that the GPS draws low amps, and the XM receiver draws low amps as well. Sorry if this is in the wrong forum, moderators feel free to move if needed. Thanks in advance fella's. Stand by for a thread with pics of the install once i get an answer to my question. Out here.

 

You can use the add a circuit for both. I wired my GPS and Sirius on one add a circuit. I did use two 12V outlets and mounted both behind the kick panel on the driver's side. You can also use the second row/first or second slot for another add a circuit as that slot is open on the fuse box if you want to separate them.