It depends on the courier. Most couriers will allow household members to accept the package on your behalf(photo id may or may not be required). Best to confirm with them.
I’m not sure how many courier services fizz are using, so far I’ve only dealt with one for 2 separate deliveries. You will only find out who it is after you purchase the phone unfortunately.
When it comes to receiving a phone delivery from Fizz while you're not available at home, there are a few points to consider:
I just received my phone tonight and I didn't need to show ID to the delivery person, I just needed to sign. So likely anyone in your household could sign for the phone.
Oh and the courier company never updated the status to out for delivery, so I didn't know that it was going to arrive today.
Hope this helps,