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so you could try to use attachTo, so the spawner should be attached to the player and moving(not quite sure if attachto works for this kind of objects)
I posted a script that'll spawn zombies around players.
I know it's old, and I don't want to be diggin' it, but... Here you go:
Let me refer as this
spawner - spawner
unit1 - unit
while {alive unit1} do
{spawner setpos (getpos unit1); sleep 5;};
Place in init.sqf and should work like a charm.
My way should allow you to adjust the spawner to your liking
ZombieSpawn_1 attachTo [this, [0,0,0]];
i call the spawn module ZombieSpawn_1 and placed the above code in the units ini field. Works really well. Its very random with the spawning.