I just cant see how you can do these checks when it is almost impossible to get under the car.I think that it must be lifted in some way to give access. I still think it is worth getting it done when the car is on a lift and it is safer. 
A method of doing the checks that certainly works is .. park on a known flat, level piece of ground; jack up to obtain access; remove filler bolt; add fluid until it just dribbles (with engine running in the case of the gearbox); then WITHOUT REPLACING FILLER BOLT lower car back to the ground (best to have a container under to catch the excess); once the item has stopped dribbling; jack the car back up; replace filler bolt. You now know the levels are correct.
This works well if you have the flat.level bit of ground to start with .. I don't, so I wish to set a datum from which to commence and then lower to in the middle, hence the reason for the question

TD .. Sally Pusey's might object, slightly, to me jacking the car up in their car park and spilling ATF all over the place before going in for a very smelly beer !! Unless they've installed a ramp/dug a pit that I've not noticed .... now there's a business proposition .... a pub with a garage/lift/pit attached that can be hired out and refreshments served ...