I wanted to set up a guest wifi for friends and family when they come over so it's easier to manage. I found an option to enable a guest wifi on my fritzbox with a separate password and enabled that. Seems to work fine.
My question now is: For better wifi signals, I installed an old, spare router as an access point in my appartment. Will the guest wifi now also be available on this access point or can it only be accessed using the fritzbox, thus making the signal very poor in some rooms?