You have two (or three) reasons not to worry about antispoof rules.
- They only apply when you are operating as a router, with multiple NICs.
- Your only other "NIC" where you proposed rules is your loopback psuedo device lo0, and that has an address assigned to it by default: 127.0.0.1
- You could use my 4 rule set, which does not use antispoof.