Implement a pop-up on www. and m. domains

Hi everyone!
I’ve been using unbounce quite a while and implemented landingpages, sticky bars and pop-ups already. With pop-ups though I am facing an issue: We run a desktop and a separated mobile website (www. and m. subdomain). When setting the URL target for the pop-up I need to enter the subdomain to make it work as expected, but then I have to do two pop-ups, one for each subdomain, even though the pop-up itself is responsive. Is there a way to only use one pop-up? Otherwise I am running out of pop-ups included in my plan at double speed :wink:

Regards,

Tim