At the Taoyuan airport, there's a small cafe on one side that affords a good view of the runway with some good spotting -- it's built right next to where the CI
A300-600R coming in from DPS
crashed (it's called "Miracle Cafe," apparently because a very large chunk of the wreckage went right over the house and landed on the road in front of it).
One the side where you will be (at the EVA hangars) there's a private piece of land -- the farmer who owns it allows spotters access to a sluice gate that is a popular spotting area. Last time I was there, I noticed that the military had closed off the access road to the area, but that didn't stop anybody -- I simply parked on the public road and walked -- the other spotters who arrived after me just drove around the cones that closed off the road and went their usual way. Often when I've been up there spotting, the airport police have driven past and waved at us ... never been hassled at all.