There is no option to run Fulcrum on RoninDojo (AFAIK), but you can run it on Samourai Dojo. So, if you are running RoninDojo on a SBC then you can't install it.

Fulcrum is the fastest electrum server by quite a bit (https://sparrowwallet.com/docs/server-performance.html). However, it has tradeoffs since it indexes the entire blockchain (larger storage needs).

Since I run my Samourai Dojo on a Linux server, that was the indexer I chose to run and it was quite easy to do with their implementation.