WP125 Need to Rotate Ads bith out using Widget

I need to rotate out the ads on my site as well, but not using awidget due to layout, I followed the above example and used the code <?php $num = rand(1,6); wp125_single_ad($num); ?> for each of the 6 ad spots, now sometimes, I get 4 of the same ad in the spots, how do I refine this code to only display one of each advertiser but in a different spot each ? In other words I want 3 ads across and 2 rows, then Random order. The settings only allow for 2 cols.

Here is what I did to display ads:

<div class=”Ad-125″>
<?php $num = rand(1,6); wp125_single_ad($num); ?>
<?php $num = rand(1,6); wp125_single_ad($num); ?>
<?php $num = rand(1,6); wp125_single_ad($num); ?>
<?php $num = rand(1,6); wp125_single_ad($num); ?>
<?php $num = rand(1,6); wp125_single_ad($num); ?>
<?php $num = rand(1,6); wp125_single_ad($num); ?>
</div>

site is https://www.rceno.com Ads are on Upper Right Side