How are house hackers continuously house hacking from 1 house to another?

[Susan Tan]

I had househacked in the past for a 3plex building that I own in Texas but have moved out of. I still have a FHA 30-year long low interest mortgage on this 3plex and all 3 units are rented out to long term tenants. How would I continue to househack? How do investors here continuously househack? I can only have 1 FHA mortgage at a time, right?