Its a good question imo as the rules dont clarify anything about spreading and how it should be done. As i said i remember the rules to be 3 in a row. Or ive been told so. However it seems to be from admin to admin what spreading means. As always
Make some clarified rules with pictures and nail em into stone?

its not many at all to cover.
In this case its spreading with 4 tiles to gather more pax. Is this allowed or not

and if its allowed it should be allowed on all servers i guess as there is no server specific rules on btpro.