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@GoTigs
Suction mount is going to work best here. And a "rideshare" or "taxi" cam which has a built-in rear-facing cam will be far more practical than one having a cable to the rear cam, even though these don't have great rear coverage. Not too many decent rideshare cams and not all of them have a suction mount. If you're wanting to use it after this trip for your own car it's worth getting a better cam, but if you're just looking for something basic the Nexar Pro is OK and cheap; be sure your phone works with their app (
LINK) If you can do with front-only coverage the B2K is a very good cam for the price (
LINK) You'll also need a microSD card with either cam and Samsung EVO Select from Amazon is a very good card at very good prices. Get at least a 64GB size to hold ~6+ hours of driving. Better cams can be had within the upper range of you're budget.
You didn't mention your itinerary but do check the laws where you'll be driving, as in some countries (mainly in Europe) have restrictions on what you may film and in some a dashcam is illegal to use. Also note that dashcam theft is an issue in some places, so best to remove the cam and avoid the break-in risk if you're parking in a bad area or overnight (easy to do with a suction mount).
Phil