No one is stopping you from paying for review,  but you are approaching it in the wrong manner. It could be that you need professional advice about this in order not to totally ruin your reputation in this forum. I will give you some hint even if you didn't pay for it, giving freely is the mutual advantage of this forum.

You don't need to be specific that you need a positive review, it is unethical and a dishonest behaviour. Just state that you need a site review, and you are paying $5 for each review. Once there is payment involved, the reviewers will automatically be biased and review in your favour. That is how things work. They won't take your money and drop bad reviews.
Keeping the review neutral will also attract more reviewers and sound minds. No one will leave you a bad or negative review, the worse scenario will be a criticism which will further enhance your growth.
Tbh, the type of review your are requesting will not give your company room for growth, it will massage your ego or reputation and the words of insincerity will be so much misleading.