Go to Eden Editor
Place in Zone Restriction Module > (F5 Modules - Others - Zone Restriction)
Set the variables. All default, "Apply to "= Synced group units; "Inverse border"= NO
Place a Trigger , 50 x 50 x -1 , Act.=Bluefor present, Type=None
Sync the trigger to ZR module
Place playable Bluefor units
Sync the units to ZR module
Play the scene

Observed:
Even keep stay in the trigger zone , the player received the warning message "what the hell where I go " and then die in a explosion.

Back to editor, set the module variables, set "inverse border"= YES.
Observed:
No matter where the player move, would not get any message or harm.

When I google, all the topics on net about Zone Restriction Module are out-dated, their solutions don't help at all in this Arma3 version.

*And in official WIKI , you even didn't give a useful readme about Zone Restriction Module ! The current one is in Arma2 !**