It's easy to install the remote above the ashtray/spectacles tray on the left side. It has easy hand access. I have mine there and like it.
This works better, of course, if you hardwire to the fusebox.
2015 SO/SO MT M3 :: Exec : Lighting : Adaptive : HK : CF trim : Full leather : DAP : Black 19's : sunshade
Crystalline tint 40%/70% on windshield : M performance mirrors, spoiler, splitters, lip : RKP diffuser : Fully dechromed
Bavsound Stage 1 : V1 Savvy hardwired : Self-coded