Eero

Hi so I'm not technical at all and moved to a new property with thick solid walls!  As a result although I find the wifi ok my son who is a gamer finds it poor upstairs in his room while using a cheap wifi booster.  I've purchased eero 5 as someone recommended this but it doesn't work following eeros app set up so I think I need to look into this further.  However one thing I've noticed is that we have signed up for digital voice as our mobiles don't work too good in the house so need a landline, am I correct in saying that if I do what needs doing to get eeros to work that the digital voice won't work as I'd need to disable wifi on the smart hub?  I don't really understand any of this but found this info on various chats?  Thanks very much