Like me, and everyone else, the bottom screw mount is a standard thread, thank the gods they didnt use some Google only thread design. SOOOO I am using my old Arlo camera mounts. They screw into walls, and have the threaded mount. When setting up the camera, choose the "other unsupported Google mount" option. It will work.
I apologize for my late response and thank you for all of your patience while waiting for a reply. I can definitely understand how frustrating your situation must be. I just wanted to make sure that your issue is addressed. I am afraid that because the IQ Cams are no longer available, you will need to look at other third-party options for getting a Chime Connector. I am terribly sorry for the inconvenience.
Please let me know if you need further assistance.