Helped a friend set this up:

Umbrel node on an old laptop running Ubuntu Server

Cold wallet on second (dedicated) laptop with Coldcard+Sparrow

Watch-only access (for monitoring and deposits) on Android BlueWallet

Both wallets communicate with the node using Tailscale.

Setting this up was a pretty fun project! And that laptop synced up in a day and a half. So much faster then my RPi node (~7d).