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Under the battery cover, the little egde bit that makes the gap next to the powerboard.
Well I wouldn't recommend putting it in the battery cover, gonna be a hassle to turn on and off, I would say stick with putting them in the trim, that's how most everyone does it alot easier to access too.
I personally think that the best spot is to just mount is in the UMD drive. The reason I think this is because It is easier to do then cut the trip or the case itself. But thats just my opinion. And even better is to just wire it to the wifi switch. I like to keep things clean and simple with using what I have other than complicating things by adding more components. But thats just me