Some 360 panoramic view skyboxes made with 8K hdri materials in unity. There is no distortion of the objects in view. 2 packages,10 styles.You can adjust the Y-axis to find your preferred Angle of view.The photos were taken screenshot in VAM.
Pack1:Grassland Sky
Pack2:Beach Sky
Sample:
Pack1:Grassland Sky
Pack2:Beach Sky
Sample: