Here is your best practice, step by step:

First of all, let's understand what ''high PR backlinks'' mean?

Getting high PR backlinks is almost equivalent of getting high PR relationships with high PR people.

At the end of the day humans (even those who work in Washington Post, New York Times, Mashable ---- top websites to get backlinks from, they are humans too).

So in order to get what you have the following 3 options

1. Hire somebody who have already built these relationships. They have a proof and there is a context /fit between their relationships and your business.

2. Hire somebody / an agency who is going to build the relationships together with you. Make some template emails and email sequences with the. Build your desired website pages together with your agency and let them do the work, share reports with you, forward the emails and responses they are getting and hopefully get it done after some hard work

3. Build the relationships yourself. Since your time is valuable you need to manage some staff

So I think the second option is the best option for you! Instead of finding a platform do the following steps:

1. Find a marketer / agency who understands your industry and has at least some 5-6 years experience working

2. Let them do some research and find a list of influencers and websites that would be attainable to get backlinks from

3. Filter the list together and give your final approval

4. Let the agency / freelancer make some email outreach templates and offerings? What do high PR websites get when they are linking to you? Do their visitors get a valuable recommendation when they refer to you?

5.Let them start the networking and analyse analyse analyse. Analyse what works, who are more open to work with you and adjust your upcoming lists and email templates accordingly

I am marketing agency owner and with my team we have accomplished lots of backlink creation campaigns along with other growth solutions ---> https://www.incredo.co

Would be happy to support with more details over the phone :)