Spawning many props

I’d like to spawn more than 200 dynamic walls on an island. Is this possible?

Yep

How? Was the hard limit of 100 per device 200 per island removed, or is there a secondary method beyond using SpawnProp?

you can spawn 100 props per Verse device at a time, the documentation is inaccurate when it says the total limit is 200. I don’t know the actual limit but I’ve seen people do far more than that.