multisite subdomain with unbounce

Hi, i have a wordpress MS with subdomains. Now I want to use unbounce for my landing pages but then I have to cname a subdomain to unbounce for consistent urls in my ads on Google. Problem is that there's a wildcard a record to my servers ip for the multisite so when i create a subdomain and point it to unbounce it's not working. Any ideas for workarounds or a solution to this?

thanks, cheers!