GARD (Google AdSense for Responsive Design) allows you to easily place Responsive Google AdSense in your WordPress website's content.
This has not been tested in a MU environment. We have reports of it crashing MU websites, so I would only test on a non live website.
Yes. If you would like your ads to align left, use the shortcode [GARD align="left"]. The same is true for center and right.
[GARD] will not center or wrap text.
[GARD align="left"] will make your ad align left and text wrap around it.
[GARD align="center"] will make your ad centered and text wrap NOT around it.
[GARD align="right"] will make your ad align right and text wrap around it.
No. You will only need to create an ad for each size that you want displayed. Feel free to leave the field(s) blank to skip that size.
We check for three types of ads; link units, ad units, and the 300x600 ad size. If either the link units, or ad units already have 3 per page, we don't output ads. Same goes for the 300x600, if there is already one on the page, we don't output a 2nd.
GARD (What you're looking at now)
GARD Pro (Offers many additional features to extend GARD)
* GARD Pro costs $24.95, and is appropriate if you expect to make more than $24.95 in ad revenue from your site. :P
Support is available on GARD Official WordPress Plugin Support Forum.