Hi there,
Let me do the best I can to answer your questions.
If the third-party ad network supports Android TV, then technically this is possible on the mediation adapter as well. However, I could not comment if this permissible base on our policies. With this, I would recommend contacting out
Product Support team to get a better insight on this.
As per the IMA SDK, I'm afraid I could not provide an insight as this is out of scope to our team. It would be best to contact our IMA SDK team through this
forum for further assistance.