Thanks for your reply @KittenKatja!
I C
You can spawn them outside and then move them inside the 32-area; they won’t die (unless they’re in the same 1x1 area and are greater than 10 since max entity cramming is 10 here).
I don’t know if it’s a cuboid or a sphere (my money is on the latter). 32 is the radius.
Dispensing Water
There are a couple reasons to preferring dispensable water to waterlogged trap doors. (A loss in output is not one of them since you can just build a bigger farm to make up for the lost area.) Most of them are not a big deal in a server this size but if it grows it will be worth considering. For now the primary reason to prefer is lowering the build and design effort for players. For example, a crop farm with a water-harvest mechanism would have to be 12.5% bigger to incorporate waterlogged trapdoors instead of dispensers with water. Overall it’s not a big issue, it’s a quality of life change that could be easily implemented.
Warp Totem
Having a single warp totem is a viable solution to all the problems I listed above. Like I said, I don’t think my suggestion will be popular since there’s not a pressing need for it. I prefer multiple player-specific warp stations to allow users the convenience of creating and using larger and more customizable non-mall shops that don’t require multiple interactions with the server (e.g. /warp mall *click totem *scroll to find shop *click shop) as opposed to teleporting to the exact shop in 1-2 actions (including a command alternative).