1. adguardhome yes or stubby or dnscrypt or point adguardhome to tls:/x.x not all of them at once.
  2. yes can filter clients to use vpn based on mac address or assign vpn access to users accessing the guest wifi
  3. yes if your adsl is down you can plug in your phone if you are there. if your looking at keeping a phone connected all the time as auto fail over…that will require some extra work beyond the scope of their software
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