aLapRecorder that I'm doing shows it all on the screen when both recording and playing back - but it won't output both together without a 3rd party bit of software, such as RaceRender - so just check before you buy anything!
And yeah it was just in a suction mount, it's actually a home-made hybrid of an old Garmin mount for the suction bit, and one of those clip-into-the-vents phone holder kits with the vent bit removed.