1. Can i add more than one banner to same location and show them at the same time. I mean can there be example two banners side by side? ( this could be useful on some cases)
Yes, just use the same position(s) for the second ad.
Should banners be responsive?
What ads are you using? External ads used with Code ad type are not responsive. Unless they are responsive themselves such as Adsense response units.
3. Is there a way to show banner only in the front page? So if i want to have banner on the position " Below the top breadcrump". But i want it to be shown only on the front page of the forum?
Yes, use page criteria option "Content template is:" forum_list
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Joeychgo, like I said, I can add a text field where you can add extra info about non-member advertisers and when you click on the "View details" of each ad, that info you added will be displayed there as well. When you create an ad, you can specify when it will expire and they will disable automatically after that. The date on which they expire is also displayed on the "View details" page of the ad.
All I am saying is that it would be alot easier if I could do more of that in the addon directly.
You can. And since you mentioned that some advertisers are members, you can simply use packages and keep track of everything very easily and automatically. You could simply create the ads yourself for non-member advertisers, from the front-end as an advertiser and it will calculate the total cost based on purchase length and if you go to the Admin area and click "View Details" and then approve the ad, that will automatically generate an invoice with the amount that needs to be paid. When the non-member advertiser pays you the money, you simply change the invoice status to "Completed" to activate the ads. Now you will get notified when the ads are about to expire and you can start the process again by simply using the ad extend function in advertisers area.
If I add the field I mentioned, you will know who the non-member owners are. Believe me, this, Add-on is as complete as it gets.