Ok great also to monitor IP addresses you recommend to use spreadsheet or ip burger?
Its better to track your IPs if you are using one dongle with a few accounts. The point is not to cross IPs between different accounts. Nice spreadsheet here:
There's always a need to monitor IP's just because you're using a VPN it doesnt mean they cant link via the same IP - you can't simply switch between accounts willy nilly.
That said, more important than IP is the machine and browser combo used, that's where ebay are more likely to make the links.
Yes, you need to monitor IP when you using VPN. What I know is that you don't need to put it in a spreadsheet because it's just one. Correct me if I am wrong.