Strider Spawner

[AngelicAmy]

I got a Strider spawner on One Block. I am wondering how I place the spawner in order to get it to spawn striders? I know in the nether there has to be 2 blocks of lava and air above it for a strider to spawn. But i cant place a spawner on top of lava. I currently have the spawner placed on nether brick next to lava. But nothing is spawning. I tried looking on google and didnt find anything.

 

[Leon?]

Idk if it works the same on one block but on kingdoms it just needs air and no light