Can you please tell me how to display ads in categories on mobile devices - the gallery and on the computer - the list?

How do display ads in the mobile version - the gallery? and on the computer - a list

@Hunter
fact if gallery or list is generated is done on PHP level and as you know, PHP is rendered on server, not on user side, so it cannot recognize mobile (maybe it can with some checks of device)

Can you please tell me how to display ads in categories on mobile devices - the gallery and on the computer - the list?

May be you can implement this one.
http://mobiledetect.net
I used in past working good.

@Ivanko
It might work, but screen size is probably best way for identification