Tailscale is completely unnecessary here, unless OP can't connect to Mullvad.net in the first place to sign up. But if the Indonesian government blocks Mullvad nodes, they'll be out of luck either way.
> - Your own VPSs with Wireguard/Tailscale
Keep in mind that from the POV of any websites you visit, you will be easily identifiable due to your static IP.
My suggestion would be to rent a VPS outside Indonesia, set up Mullvad or Tor on the VPS and route all traffic through that VPS (and thereby through Mullvad/Tor). The fastest way to set up the latter across devices is probably to use the VPS as Tailscale exit node.