Hi not sure whether you solved this, but I have just updated a website to include a WA Pro map on a responsive website
All I did was to change style from pixels to a percentage
from: <div id="wagmp_map" style="width: 600px; height: 375px;"></div>
to: <div id="wagmp_map" style="width: 100%; height: 375px;"></div>
the map is placed in a responsive row, set to fixed width rather then fluid width
the page has got 4 responsive break point and the map fits the width perfectly in all.
The depth is fixed, however the 375 pixel height works well on tablets and phones
hope this helps