loop to linq

a.cs

var a = response.Data
                .Select(dto => Mapper.Map<SafeZoneDTO, SafeZone>(dto))
                .Select(safeZone => safeZone.Points)
                .Select(model => new SafeZonePosition {
                    Latitude = model.Latitude,
                    Longitude = model.Longitude,
                    SafeZoneId = safeZone.Id
                });

foreach (var dto in response.Data) {
    var model = Mapper.Map<SafeZoneDTO, SafeZone>(dto);
    foreach (var data in model.Points) {
        var safeZonePositionData = new SafeZonePosition();
        safeZonePositionData.Latitude = data.Latitude;
        safeZonePositionData.Longitude = data.Longitude;
        safeZonePositionData.SafeZoneId = model.Id;
        listOfPoints.Add(safeZonePositionData);
    }
    ...
}