Purchased Domain for Backlinks?

Hello, I purchased a domain with quite a lot of backlinks. The business domain (www.junglesurfing.com.au) use to be used is very similar to my current business domain (www.farnorthescapes.com.au). I tried creating a separate project for the purchased domain and 301 redirecting it but didn’t seem to work. So I added the domains to my main project and 301 redirected them from there. Please see the picture below:

Is this the correct way to redirect purchased domains purely for their backlinks through webflow? Or should I create a separate project and redirect it? And if so how do I do this?

Thanks, Josh