There are some posts here on the subject if you do more searching, but the first post in this thread is probably the best resource: Xiaomi & Aqara Devices - Pairing & Keeping them connected
In short, you'll want to have repeaters because they are sensitive to "falling off" the network, but you also want to make sure your repeaters are known to play well with Xiaomi devices (they are not standard and many repeaters don't handle them reliably--the Hubitat hub didn't either until an early firmware update). Unfortunately, there are few. An Xbee is quite reliable but requires some assembly; most/all of the others are select smart bulbs (despite these reports, I'd still be careful since many are known to behave poorly on ZHA networks) and a discontinued Sylvania plug whose newer, incompatible revision is likely the only one you'll find.
