Be aware that if the upper floors aren't on the same electrical circuit as the "master" booster unit, then performance may be disappointing. My personal view is that "boosters" are a poor solution to the inadequate wifi from VM hubs. As they should be free you've got nothing to lose by trying them, but personally I'd suggest you should be checking out a mesh wifi system that'll cost around £100 for something quite decent from (say) TP-Link to £300 for a dog's doodah solution (maybe TP-Link, but Asus and Netgear command the technical higher ground). Avoid mesh systems from Amazon/Eero, Google/Nest as they're (usually) poor value for money unless you can get say a Black Friday deal, but even then they'll still be piping all your data back to the mothership, and your at the whim of companies that have a reputation for ending support for products that fall out of corporate favour. BT Whole Home disks are similarly poor value, but worthy of consideration as they are a very easy to fit solution and use your hub in router mode, so very much "plug and play".
If buying any mesh system, make sure it has gigabit ethernet ports, otherwise that'll drastically choke the connection between the mesh and the hub.
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I'm aware of the fun you can have with Powerline adapters and luckily my house isn't wired too badly so they should be OK. I was hoping this new Hub4 would improve things but if i'm honest its worse than the last one least for reach.
I was hoping a member of support would reach out and offer to send them but guess i'll have to jump through hoops to get them on the phone.
Don’t hold up much hope for them giving you any sort of decent signal
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