I may be completely out-to-lunch, but does Stellarmate bother launching it's own hotspot WiFi if it can establish a connection your home network WiFi? If you're using the phone app, I think you can establish a second alternate connection to your equipment that uses your home WiFi, so you end up with a choice of using either (depending on which is available). In the past, I remember disabling my 5G home WiFi temporarily, so I could get it to create it's own network as an alternative (disclaimer: this may not have been for Stellarmate, but for a Ubuntu installation).