I have a client using Tealium IQ as a tag management system to deploy site tags (e.g. DCM Floodlight tags). I've been told that not more than one tag can be deployed on the same page/URL as the latest implemented tag would override the existing one. Is there a work around this? We have both a counter tag and a sales tag, and both should fire.
I've not had this problem, @iris-tan, when dropping multiple Doubleclick tags onto a page - each one can have a separate variable mapping in Tealium, and when they fire, they go into separate iframes with distinct IDs.
The only issue I've ever had was with re-firing an existing Doubleclick tag before the connection had been established in the iframe, but that doesn't impact you if you have separate tags within TIQ.
In my current implementation I am triggering multiple tags of the same vendor and its similar to what you have mentioned counter and a sales tag, both work perfectly fine. As far as my knowledge there will be no such issues.