The idea with the large plates is that they are trapped terrain. You can't walk through them so find other approaches
1. You can get one member to run through, trigger it, and warp the rest of the party to where one member is now safely at
2. Use feather fall (or teleport if you have a high health member) to bypass the terrain.
In the house that Halcyon mentioned, if you read the journal the original owners trapped the basement to keep the undead out. It would hardly be an effective trap if your party can just easily stroll over it.
