Behind the passenger compartment back in the structure leading to the tail is ususally a good location. We're most worried about moving ferrous metal, and the tubes back there shouldnt' cause too much problem. Mouting it as far away as possible from the tubes is still a good idea though.
The strobes in the wingtips won't cause us any problems. Low current, high frequency devices like strobes are usually okay. Things like landing lights or nav lights can cause problems though.