In short, no. There isn't a certain number that Facebook recommends. But, keep in mind if you do utilize carousel ads with multiple images/videos, they will auto optimize and the best ones will rotate to the front.
On social media reporting if running Carousel Ads, we provide the top 5 five cards* in a carousel ad. This is in addition to the top 5 performing creatives page. Carousel ads can have up to 10 images or videos [...]
There are many different types of targeting options out there for Facebook and Instagram. Here's a guide on what types of news feed ads are available in addition to static (one image) news feed ads:
Facebook and Instagram Carousel ads can drive up to 10 times more traffic to advertisers’ websites than static sponsored posts on Facebook. Research studies have found that they can receive a 72% higher click-through rate versus single image mobile app [...]
