10m might work ok. As @Tony pointed out, it really depends on what building material are obstructing line of sight. A repeater can help if that location causes dropout, but the Xiaomi don't respond well to just any zigbee repeater. @gavincampbell explains his testing with the Sylvania Smart+ (non-A version) here, and there is lots of info about the Xbee as a repeater, both in that thread and here.
Download the Hubitat app
