I've lived and worked as a broker in Frisco for 19 years and I know this area well. Have you looked at the rental comps? What size is the house you are purchasing? Who is the builder and which school district is it in? All of things things will greatly affect the rental amount.
Great builder! There are a lot of things coming to this area. The intersections of 423/380 and Preston/380 are both going to have massive commercial developments. Here is just one example: https://www.dallasnews.com/business/real-estate/2018/06/25/hong-kong-firm-plans-huge-frisco-development-shopping-mall-office-towers-hotel-apartments