I'm going to use a 10 metre extension cable for my landline and wi-fi hub, will this impact on the signal etc, or does it make no difference, thanks in advance.
Before Wi Fi I took an extention from the hall socket to an upstairs room and sited the router next to the PC.
It was absolutely fine and used it for years like that.
Two things to be wary of:
If you ever have a line problem they will want you to plug directly into the master socket for testing purposes.
I'm guessing you don't currently have fibre broadband; if you change you might have problems.