Go to the BP_PlotPole and create a new function called HasMaxOwners and add a new output set to Boolean called ReturnValue.

Then create a new variable called MaxOwners and set it to Integer and set the default value to 5, this is the max number of owners, you can set it to what ever you like.

Now create another variable called UseMaxOwners and set it to a Boolean, then set the default value to true if you want to use the max owner feature.

Now copy the images below.