cpa offer setup

I recently started a YouTube short upload in the pet niche though no tremendous watch time yet. But I am thinking of monitizing using CPA offer. My question can I use an offer not related to the cat pet niche? Anyone tried it and was it successful?

It seems like my mobile browser check scripts are not always correctly identifying mobile traffic as I often see mobile users hitting my standard Desktop CPA channels. What is everybody using these days for mobile browser checking? I also need a good working Geo-IP redirection script so...