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Remove the driveshafts.
The 2010 GMC Terrain is flat towable with automatic transmission
You typically have to remove the driveshaft.
yes it can
You should never tow a car with Automatic transmission
A 2006 - 2009 manual transmission FWD SX4 can be flat towed. None of the automatic variations or AWD variations of the SX4 can be flat towed.
Place the transmission in Park and the transfer case in neutral.
Yes with the front tiers off the ground.
Can it be done? Sure. Should it be done? Absolutely not - you'll destroy your transmission, and flat towing a front-wheel drive vehicle is never a recommended practice, even with a manual transmission.
That would be the 4L80E if it is an automatic. Not sure on the stright stick.
If it has a manual transmission, you simply put it into neutral. If it's a 4x4 and has a manual transfer case, either with a manual or automatic transmission, you simply put that into neutral. If it's a 2wd with an automatic, or a 4wd with an automatic transmission and an electronic transfer case which does not have the option to put the transfer case into neutral, then you have to disconnect the driveshafts.
If it has a manual transmission, you simply put it into neutral. If it has an automatic transmission, you would need to remove the driveshaft during towing.