Ad injection engine or insertion for browsers, ICAP protocol, Banner Ads setup/install/develop

HI, I need someone skilled with Ad injection ICAP protocol or similar for hotspots to be able to advertise on users device browsers of all types, I want to advertise using banners and customize the Ad and change the content as required. This will need to overlay onto the users browser, with possibly backup frames to handle javascript in case the browser isn't supported by the banner. I can explain this in more detail later. I need to integrate this Ad injection into a variety of hotspots in my local area, hotels, restaurants, cafe's. etc. please message me if you have a suitable platform in mind for this, I'm not asking to develop or reinvent the wheel, if there is software doing this already then great, it would be fine. please msg me to discuss what options are available for my needs.