I have mine mounted in the middle of the windscreen in my Audi and its a pain in the arse every time the thing goes off and you have to lean forward to stop the beeping from driving you insane especially if your strapped into harnesses! (I know you can have it on silent but then I found out the hard way that there is no point in having it then if it doesnt properly alert you)
Mine is centrally mounted and fed from between dash and windscreen. A halfords ciggy lighter socket has been wired into the ignition (inside the steering cowl) so that the feed wire/plug didn’t need to get chopped.
I think for me it is a case of familiarity … I have one in my RX8 on the right corner, so that’s where I was thinking for the Exige - easy to reach - and I’m used to looking there when a beep goes off!