Welcome to nostr where ur follower numbers won't display right but they will be there. The more relays you add to your profile the more you will see each relay is it's own feed from a site so it depends if you want to see more or not. The more relays you add to ur profil# the faster your mobile battery will drain as each request to each relay is a constant fetch.

Any relay connected can delete your notes & you will have no notification of it.