mine has a garage door fob so i keep it usually in the small compartment behind the cup holders or in the cup holder if i plan to drive in such a manner where it'll fall out of the other pocket. the door pocket is huge (bottomless i'd say) so if you have a massive amount of keys that might work. i have a famous worn out checkered plastic bag full of the all the keys to cars in my 'capannone' (==industrial unit) and that lives in the door pocket when i'm going there.
...sounds like most folk have their car key loose or separate from house, garage, gate etc keys if that's case is it just the fob loose or do you attach something to it that makes it less losable like a tag or lanyard etc that makes it easier to locate
for me the idea of a stand alone fob would terrify me, the thought how easy would be to loose it