"motivators behind" is correct and can be used in written English.
You can use it whenever you are referring to reasons behind a person's motivations or actions. Example: The motivators behind her decision to become a doctor were her mother's example and her own strong desire to help people.
The barriers he faced were the motivators behind his decision to co-found UNLOCK 12 years ago.
While budget is one of the biggest motivators behind choosing a midweek wedding, it isn't the only one.
"We start by working to dispel the stereotype that all businesses are identical in terms of the motivators behind business activities," he says.
Focusing explicitly on the offending act itself doesn't provide a full picture of the driving factors and motivators behind the crime.
It is occurring in a sexual arena, but equally and clearly in most cases, in the vast majority of cases we have insight into, there are very powerful motivators behind sexual aggression.
UBS cites Microsoft's significant focus on regulatory compliance as one of the key motivators behind their move to Azure not surprising considering the abundance of regulations in the financial world.
The uncertainties of state funding are the main motivator behind the growing interest in outreach.
The polls showed that fear was the largest motivator behind the support for New Democracy, Mr. Panagopoulos said.
The soaring price of the nuts over the last few years is seen as the chief motivator behind the thefts.
He described the entrenched culture of deal making in his home state as a prime motivator behind his presidential bid.
To investigate the impact of low energy design on architecture thirty years ago, global concerns were focused on fossil fuel depletion rather than climate change as the primary motivator behind both energy conservation and the use of renewable.
