@mouschi I’m glad to hear it seems to be good to go for now! It sounds like moving the router up did indeed help, and I’ve heard of other people having relief in moving the router to an upward location to help improve their wifi enabled devices.
I do recommend wifi extender(s), like the Chime Pro, but really of any kind that seems fit for your home. I also recommend that you should purchase them from website like Amazon, and ensure there is a 30 day money back guarantee with it as well. That way, if you find that it does not help or change how your wifi is preforming with the devices connected to it, you can return it and know that it was already as good as it could get! Please note that the Chime Pro will help only Ring devices, but other wifi extenders, like the Eero system, work throughout the entire home.