Based on your reply, it’s probably safer just to install Electrs from the Umbrel App Store. The main reason to use Fulcrum is for 50% response times over Electrs. Why not start with Electrs and see how it goes?
If you have a real reason to use Fulcrum, then watch the whole video and decide if your up for the technical challenge. Ketan’s Nodebox is a Dell Optiplex with Ubuntu server on it. You would SSH into your Pi OS and then execute the same commands. I would expect some technical issues that you would have to sort out if you went this route.
Good luck.