Slightly more seriousely.........
Snorkels are fitted in the desert so to lift the air intake above the dust cloud and extend filter cleaning intervals to something greater than fuel tank range..... or for 'seriouse' wading, by which I mean water over the bottet water work.
Here in the UK, we dont tend to suffer the desert filter syndrome, so not really worth while, and wading with a V8? Well as the reputation suggests, you are going to find the 'limits' of such activity LONG before a snorkle, is needed to stop water being sucked up the trumpets!
Hand-book says that a Range Rover is 'Safe' to wade up to the depth of the sills; many of us have taken them further, even without any seriouse 'preparation', but by the time water is lapping up the top of the wheel-arches, and you are in 30"+ water, Ie waiste deep, you'll have the starter motor completely submerged, the axles completely submerged, and water sloshing all over the major bits of electrical equipment in the engine bay, like the coil and distributor; and given the usual state of RR Door seals, water lapping over the gear-stick inside!
IF......... you get that far........ and the water hasn't shorted the ignition LONG before you get that far..... most will start missing pretty soon after the first sprak has hit the exhaust manifolds..... ie in 6" of water.
So yeah, you COULD fit your snorkle.......... but you've got a LOT of other stuff to water-proof before it's needed...... starting by fitting the wading plug to the bell-housing, making sure that the axle breathers and 'vent' hoses are attached, in good condition, and extended to the sort of height needed for deep wading, then dealing with the 'lectrics........