Do I need a VPN for the multiple client projects in SEO?

Do I need a VPN for the multiple client projects in SEO?

if you are OK with sacrificing more time and privacy to change your IP address for SEO tasks and reporting, then using a Proxy is the way to go. Definitely use a private proxy, though!
If on the other hand you can budget a few dollars a month and want to save precious time, then a VPN is your best bet. The added bonus of solid privacy protection is a very nice cherry on top.

I never recommend you any software or tools which will create backlinks for your website because most of the links are built from low quality and spam websites. This also violates Google guidelines.