/worldprimer spread-player [options] <playername1 playername2 ...>

The command has two location search/selection modes: grid, and random.
If the grid option is given with the grid size, then the grid mode is used.
Otherwise the randomized location mode is used.

Options:
    --find-surface=<true | false> - If true, then the y-position is set to the top solid block on the found x/z position.
    --grid=<integer> - If given, then an outwards spriraling grid search pattern is used instead of randomized locations.
    --max-radius=<integer> - The maximum distance from [0, 0] (per axis, not the absolute distance).
    --min-separation=<integer> - The minimum distance to previous player spread positions and any currently online players in the same dimension.
    --new - If given, then if the command is run again for a player who was spread previously, then a new location is generated, instead of teleporting them back to the original spread location.
    --y=<integer> - If given, then this fixed y height is used.
    --y-offset=<integer> - If given, and --find-surface=true, then this offset value will be added to the surface y position. This allows the position to be offset a certain distance under ground for example.
    --y-max=<integer> - Limits the (possibly offset) y position from the --find-surface=true case.
    --y-min=<integer> - Limits the (possibly offset) y position from the --find-surface=true case.