purchased Deco X50 3 pack to make sure wifi in garden room works and can be reached.  Have a sky max router with sky q dowsntairs and a sky q mini box in bedroom connected via wifi and sky q minibox in garden room connected via ethernet.

am new to this and need to know best way to set up the deco system so not to disrupt the sky q current set up and cause issues.  can someone guide me through best way to set up?  Ideally don;t want to have to reset all the sky q boxes and system - just need stronger signal in garden room - basically extend signal there from main house.