Question about Group Permissions

Someone would like to sell sculpties on my property and I'd like to give them permission. The problem is that I need to be able to move their stuff around and I can't do that unless I extend a group invitation to them. I'm afraid to do this with all the bad things that have happend to people.

Any recommendations on how setting should be for group inviations when all you want to do is to allow someone to set something out on your land?

The other option is that they give you mod rights to their items. This would allow you to move them.

Create a specific group member role and tailor the permissions for this particular purpose. You can make sure that their abilities only pertain to selling activities.

On the land, allow group members to place objects.

Then the seller needs to set their objects to group.