[Misiur]

Most of those scripts aren't really 100% random. Of course you could create true randomness, fetch Z position using MapAndreas, but you'd have to refine it. Usually it's done like:
1. Create an array of viable positions

pawn Код:

static stock const Float:Positions[3193219837132][3] = {
{ X, Y, Z },
{ X, Y, Z },
//ad nauseam
}

2. Generate random number between 0 and sizeof Positions - 1
3. Use that as an index