I'm not sure about randomSK, but I got it to work like this. sets the spawner right where the block was placed.

Code (Skript):

1. on place:
2.     if name of held item contains "test":
3.         set {_x} to the x coordinate of event-location
4.         set {_y} to the y coordinate of event-location
5.         set {_z} to the z coordinate of event-location
6.         make player execute command "/setblock %{_x}% %{_y}% %{_z}% minecraft:mob_spawner 0 replace {SpawnData:{id:Villager_Golem}}"

 

yeah I ended up finding that out, sorry haha.
on place:
if name of held item contains "&c&l&nIron Golem&r &espawner":
run player command "/setblock %event-block's x coordinate% %event-block's y coordinate% %event-block's z coordinate% minecraft:mob_spawner 0 replace {EntityId:VillagerGolem}" as op
message "&e&lSPAWNER: &d&o%entity type of location of event-block% &espawner has successfully been placed."
make console execute command "/execute %player% ~ ~ ~ playsound random.orb %player% ~ ~ ~ 1000 0.1"

that was my final code