I am still not sure if you can have two 12V outlets. I have a Nav that runs off it and occasionally my iPOD/cell phone. So to have 2 would be great plus this way I can actually close my ashtray which is my pet peeve to have it open. I would be concerned on the additional power load and if I would need to replace the fuse with a higher rated one.
I do not mind spending $48 to ensure it is cleanly done. Plastic pieces like that can crack fairly easily. I do like the cap though for the outlet from RS.