Do you want to use tailscale so you can vpn from your laptop etc when your away from home for pihole to block ads on the laptop? Wouldn't it be easier to run ublock origin on the adblock on the laptop instead?
Pi-hole (or my preference Adguard Home) is great for devices connected to your home network. For your phone, go with Blokada (free) or Adguard (iOS, Android, paid - see Stacksocial for occasional license deals) - that'll cover you at home and out of home.