I am testing some mobile campaigns and am direct linking to start with.
I realize that I am going to have to build some landing pages to get the campaign profitable.
It is offer for an android app install. Give the huge variability in mobile device sizes how do you approach landing page dimensions? Attempt to build a one size fits all responsive lander? Or do I build a responsive lander for phones and tablets and keep the campaigns separate? Or do you get real granular and design the landing page to the exact screen size of popular devices?
I currently do one size fits all. If a campaign shows to work well then you can always tweak it afterwards but I don't think it's worth spending time/effort on at the earlier stages of a campaign.
I've been using Caurmen's lander from this thread which I found great as a start to then build on yourself.
Also, you need browserstack for testing because it's amazing how different a single page can look on different devices.
Use a responsive design. Keep it simple. Let it resize and change font sizes to suit.
The hardest part is getting landscape orientation right. For this I'd suggest setting a max-width value for the overall page-container when at e.g. device width > 800 px. This way you can keep a potrait-like page style going.