Arena must float in the air

Hi, unfortunately, I have the problem that the arena has to float in the air for it to work properly. I placed the arena so that it's flush with the map from the ground. But then the spawner where you gather is underground, meaning you get kicked for "Inside Terrain Violation 200." I fixed this, but then the next problem arose. It doesn't use the arena's current location when it starts. You then spawn in the air where the arena was before, thus in the void. Why does the arena have to float in the air for everything to work?

Then I considered letting the Gun Game island float in the water, but then the lobby, the waiting area, would be underwater and you'd drown. It's not possible to have the waiting area inside the island, like in the hall where the island is, so you can at least have the Gun Game island float on the water, because I personally don't think it's a good idea to have it in the air.