Which GL.iNet routers provide VLAN wifi client isolation?

The question presented (and answered) here is “which GL.iNet routers provide VLAN wifi client isolation?”  This is likely to be of interest to those who want to set up VLAN protection in their home or small office local area network.  The idea would be to relegate relatively untrusted IOT (internet-of-things) devices to a separate VLAN from the main VLAN of trusted devices, but in addition, to isolate the untrusted IOT wifi clients from each other.  On this page you can see the results of my actual testing as to which GL.iNet routers provide this isolation feature, and which do not.