I use the Deco Mesh system for our VM hub -
https://www.amazon.co.uk/Deco-M5-Cov...c-d11b6e3d217f
Its faultless and works superbly; whole house now has superb coverage inc the wife's office up stairs; the furthest point form the VM hub
VMs own hubs have great coverage in the local vicinity; after that it gets crap unfortunately
Took 10mins to sort; knock VM hub into modem only and set up the mesh; all done