Five Starlight Views for a standard DeathMatch Mulptiplayer map.
Save yourself any kind of grief, use the starlight view prefabs from the SAMPLE_DM map supplied by MONOLITH. It has the exact color fog that is the expected standard by all players of AvP2, it has a decent distance range though this can be changed, (though this will obviously influence game balance, so change it advisedly)
There are 5 minimum required STARLIGHT VIEWS?
If you simply count out the "special" vision mode options for the various species beyond their basic "NORMAL" view, which is unaltered, but has a HUD; you have three for the Predators, 1 for the Alien, 1 for the Marine/Corp, You need a STARLIGHTVIEW object for each of these. Therefore you need five of them in most MP map set up, and only one for most SinglePlayer setups, which ever player type you are using.