Oh in that case you may want to take a look at rclone.
You can use that to configure profiles for separate shares it makes mounting and managing them very easy.
Why would the file manager need to handle smb (mounting?)
I always setup smb shares through fstab and have them automatically mounted, lf shows the files just fine.
If you want a way to mount shares through your file manager, Im sure there is a way to add this to lfs config, but I don't really understand why.
The lfrc config in the linked repo is intended to fix that. Sure you still need to clone the config from github into your .config, but that is normally the case for quite a few tools.
Oh in that case you may want to take a look at rclone. You can use that to configure profiles for separate shares it makes mounting and managing them very easy.