I believe the recommended height for mounting temp sensors is around 5-6 feet above ground..
That depends on the ground; pavement/concrete, bare dirt, sod, etc, but the ideal height for wind is 33'. The WS-2000 can add up to 8 additional thermometers. It's easier to do that than to try and remote the anemometer.
The rain gauge should be closer to the ground as well from what I read, but I compare to 3 rain cans and they all are within .10" after a 3+" rain event. That's plenty close enough for me too.
It's no secret that having all the sensors in one array is a compromise, but AW addresses it with the extra sensors seems to be a fairly economical solution if it matters.
My primary function for my weather station is to forecast fire danger. The electric company where I live has started turning off the power when certain conditions indicate a high fire risk. I'd like to know when my area is approaching those conditions so I can get my genny out and ready. It's one thing to loose power in the winter, there are ways to stay warm and keep foods cold for a weather related outage due to storm weather, but it's another when those conditions, like those of wild fire, can exist for days. Even after conditions are lifted, every foot of electric conductor must be visually inspected before restoring power in case a branch or tree is down from the winds. In mountainous terrain, an outage could last many days. Heat is much more likely to kill than a wild fire, but that's something the politicians will have to sort out with the electric utility companies.