Yes, you can run as many nodes without making less. BUT your vetting takes longer.
Example:
If 1 node takes 1 Month to run through the vetting process, 3 nodes take 3 Months to finish the process.
I would recommend setting up one node, getting that vetted and then starting another node one the first one reaches 100%
You won’t get more storage filled if you have 5 nodes running at the same time. As long as they are in the same /24 Subnet they all get the same traffic. Thus resulting in higher power bills if one of the nodes isn’t used to full potential.
The checker for vetting process you requested:
edit:
The idea itself isn’t wrong, but if your Pi runs into an error all nodes go down, depending on the amount of storage you have, it’s probably better to split up the risk, but there are Pi’s out there running such jobs