Question about Xiaomi Wi-Fi Range Extender Pro

I already have a Devolo kit (Devolo Mini Magic 1 WiFi starter kit). I'd like to improve the signal coverage in the house, where it's weak. Does this item allow me to stay connected (MESH system) with the others or is it as if it were another network as long as I use the repeater for the devices? In this case, do you know which item allows you to stay connected? Thank you