You can fit them and they fit absolutely fine and they work. But you won't get extra articulation unless you fabricate new shock mounts. Why are you thinking of putting on longer shock absorbers? A coil sprung Land Rover achieves decent articulation as standard and can deal with most things. Axle articulation by modifying suspension can improve its ability off road but only if done properly and just adding longer shocks isn't being done properly IMO. If the reason you don't want the extra height by raising the body two inches is because you're worried about body roll or on road handling then I would assume the vehicle is used more on road and a need for longer travel suspension wouldn't be necessary.
For the price of the longer shocks all round you could buy some really good off road tyres which would probably have a much greater impact in the off-road ability of the vehicle without compromising on road too much or have a set of on and off road tyres. All the land rovers came out the factory as a compromise for off and on road and if you improve one aspect you'll reduce the other. You'll need to look at and phone suppliers of shocks to find the best compressed and extended sizes and full shock travel for your needs.
Decent shock suppliers are old man emu, Koni, pro comp, terrifirma.
There are pros and cons to all I've never had a bad experience with any of the above. The standard shocks are pretty good as an all rounder. I just can't see you getting any further off road with just 2 inch longer shocks compared to someone with a completely standard suspension set up.