I think this description of ‘nofollow’ is pretty spot on:
'The nofollow tag is a way publishers can tell search engines not to count some of their links to other pages as ÒvotesÓ in favor of that content. Why would publishers need to block such votes? Doing so can help them avoid problems with search engines believing they are selling influence or are somehow involved in schemes deemed as unacceptable SEO practices.’
While this type of SEO strategy can be effective in certain use cases, I’m not entirely sure how much it will help your landing page. Generally speaking, landing pages aren’t primarily used to utilize the benefits of SEO - and are instead geared towards paid marketing strategies such as PPC, Adwords, Email Marketing, etc. With that being said, while you can still do small things to improve the SEO of your individual landing page like editing the meta data, such as the Title, Description, and Keywords on your page.
Hope this gives you a bit of clarity!