There is nothing called undue attention for referrals, you can recommend it to your visitors with no problems.
That isn't what I just read on the adsense help page:
Sure - you're welcome to endorse or recommend the products you're referring on your site. However, our program policies don't permit you to encourage clicks on or draw unnatural attention to the referral units you're displaying on your site.
More specifically, it's acceptable to use language such as "I use AdSense and recommend it to monetize your website." However, please avoid using language such as "Click here," "Visit these links to support our site," or other similar language
So putting a referral unit on the page of of a review for that product = good, Directly suggesting a click on the link = bad, putting something like that right above it = not clear.
I like to steer clear of the grey areas. Much better to convince Google to fix their ad units.